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need gasket advice for boosting a 3.4 dohc

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  • need gasket advice for boosting a 3.4 dohc

    alright well ive definitely narrowed down my engine swap candidate down to an rx7 convertible a close friend has sitting around with no motor & the trans is in the interior & i told him i for sure want it, & my next step is engine selection.

    next week im buying a 4.0 aurora off of a friend either to put head/intake gaskets on & resell, or to jerk the engine out for the rx, and right now i have a 3.4 dohc GTP sitting in my garage that wont start & i havent had time to mess with it this week-so i have about a week to make my decision on which engine to use (its really nice to know that with a 60* v6 rwd bellhousing will bolt right up to either engines if the starter is relocated). whichever engine i use i will be putting an m90 or m67 on it & hoping to push over 300 WHP if i go with the v6 (im REALLY hoping for 400 if i go with the v8 but i doubt thats feasible on an m90).

    the big thing in my mind is im not sure whether or not stock gaskets are going to cut it or if im going to need special head/intake gaskets-can someone please let me know what the deal is here? i have 4 vehicles (camaro, 4x4 truck, gtp, & aurora) that i will be selling over the next month so i will have the cash & need to know what to buy before the money sits too long & i blow it on something stupid like another damn car that i dont need.

    with all these cars go figure the one im not selling is my 2 door 1990 4 speed auto 3.1 lumi euro lol
    Last edited by no_doz; 06-02-2009, 11:03 PM.

  • #2
    also this car will definitely be getting a pretty nice sized intercooler as well as an ms2 kit-i dont intend to upgrade internals anytime soon, altho i have plans for that down the road if it becomes necessary.

    and yes i know you guys are probably sick of hearing me talk about considering all these different engine swaps-well now i have a chasis for sure & i have definitely narrowed my engine choices to 2 (the 3.4dohc or the 4.0 dohc v-so theres not a whole lot of debate left here as to which engine since its finally been narrowed down to 2 out of the ENORMOUS number of engines considered/done research on, & the whole gasket deal is going to have a lot to deal with my decision since most places want 500-650 bucks for a set of head/intake gaskets for the 4.0, & only 130 for the lq1 (but if those gaskets wont cut it, it wont matter anyway-which is why its such a big deal). a nearly $500 difference in gaskets alone could very well dictate which engine i use since that $500 could go to better things like all the hardware im going to need to hook everything up & get it running/an ms2 kit.
    Last edited by no_doz; 06-02-2009, 11:15 PM.

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    • #3
      WELL... one thing to consider the 4.0 Aurora engine is a LAGE engine... Its basicly a N* minus a little displacement. i would make sure it will fit before you decide on using it.. the LQ1 is also a big engine but it should fit fine.. Ive been boosting my LQ1 5-7psi over 3years on stock internals and gaskets... Anyone know of any knowen issues on the 4.0L/N* engines? I would look also at the "Short Star" 3.5L DOHC V6 (timing Chain Driven)

      northstar:


      4L is a 90* V8 so it will be a tight fit in the RX7 body (narrow car) and the heads are MONSTEROUS. lol they look like big block heads. it also has 10.3:1 compression which is a little hight if you boosting it.... the M90 is awful small for a 32V V8.


      S
      Last edited by RedZMonte; 06-03-2009, 09:42 PM.
      Shane "RedZMonte"
      2004 Corvette Z06 Commemorative Edition -VIRGIN
      1995 Monte Carlo Z34 14.38@101mph, 331hp/355tq
      -Turbonetics T04E Super 60 Turbo, 2.5" Borla Catback, OBDII, 42.5# Injectors
      2004 Subaru WRX STI -Lightly Modded (SOLD)
      1994 Lumina Z34 -VIRGIN (SOLD)
      1992 Lumina Z34-VIRGIN (RIP)
      1992 L67 Lumina Z34 (SOLD)
      1990 Turbo Grand Prix (SOLD)

      Comment


      • #4
        finally i have a response well ive considered the size issue but considering people easily fit 350's in these so i figure a 4.0 should fit if a 350 is going to. the big thing i like about the 4.0 is the thought of a dohc small displacement v8 just makes me smile, as well as the fact that ive heard a lot of bad stuff about the lq1, altho i have had one before & it was a blast. about the m90, with a decent port/port match (possibly a custom intake if i go this route & can find a block of aluminum) & large tube headers-could an m90 even flow as much as the l47 will want to draw, even with an undersized pulley? a big thing that i like about the l47 is i figure making it produce a lot more hp should be much easier due to the extra cylinders (not as concerned about the displacement as long as its no bigger than 4.0)-id really like to put down a 400 NA or supercharged hp-ive done most of the research needed & although the power gains with a turbo are very nice (if sized & tuned properly), it seems like every damn ricer out there puts a turbo on their 4 cylinder or v6 & that really discourages me because id like to have something unique that will send these ricer pansies back to their garages to throw on a bigger turbo and crank up boost and maybe (just maybe) blow their ricer POS up so i can buy it on craigslist on the cheap for a field car!

        at this point, with all of these turbo cars pushing 500hp+ (if you look you will more than likely find a few in your city if its of a decent size)-it just feels like it lacks respect. i want to push that power from the get go without having to be labeled a damn ricer (which a lot of the times happens when you tell someone you turbo'd something that didnt come like that), tell someone you have a supercharger & watch their response, its just wonderful. also with the shortstar comment, that would be nice but i doubt i will find one for 500 or less.

        i strongly considered going the route of a 40 valve 3.7 (3.24" stroke ) but the cheapest one i could find was 900-1000 bucks, then the trans mounting, the researching to find info on such a rarely seen engine, & in the end it would just be another japper car & looked upon as what? a ricer. :tear:
        Last edited by no_doz; 06-04-2009, 02:13 AM.

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        • #5
          40 valve 3.7, WTF is that?

          and as far as headgaskets: in most cases they'll blow up due to either of two things:

          detonation

          massive overheating

          as long as you can be sure neither of those happen, if/when a headgasket goes it will be entirely random chance.

          and its about damn time you finally act on all those thoughts/ideas...
          1995 Monte Carlo LS 3100, 4T60E...for now, future plans include driving it until the wheels fall off!
          Latest nAst1 files here!
          Need a wiring diagram for any GM car or truck from 82-06(and 07-08 cars)? PM me!

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          • #6
            lol thats exactly what i said when i heard about that engine! its a short stroke small displacement FIVE VALVE dohc aluminum block V8 (SHO guys eat your heart out) audi put then in audi a8's since i believe 1997, but as you may have guess good good luck on finding one for any less than $1000 (which isnt bad, but most of them were 1200-1500). this engine cranks out 9 less horsepower than an lt1 or 30 less than a stock ls6, so with a free flowing set of headers/exhaust/intake as well as mild porting & port matching & a good tune, these things have the potential to crank out loads of power without nitrous/boost.

            also i thought the raised cylinder pressure will cause the head gaskets to blow unless you have metal ones or stay below 4-5psi?

            also the only reason ive brought so much stuff up & not done most of it is because i have to discuss & research the crap out of any of the projects that i come up with because i dont have the money to start a project & let it sit for a year unfinished.
            Last edited by no_doz; 06-04-2009, 02:31 PM.

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            • #7
              as long as you have a good tune, you shouldn't have any blown headgaskets, i'm not sure if i've ever seen metal gaskets for the 3.4, and plenty of people boost them without blowing the gasket, and the ones that do are the ones that don't get the car tuned....
              1995 Monte Carlo LS 3100, 4T60E...for now, future plans include driving it until the wheels fall off!
              Latest nAst1 files here!
              Need a wiring diagram for any GM car or truck from 82-06(and 07-08 cars)? PM me!

              Comment


              • #8
                i have seen RX7's with 350's in them. there are alot of guys boosting the N* motors too, low boost with higher compression is not a bad way to go.. I agree everyone and there brother turbo cars these days... but there is a reason for it... turbos are efficent, they make power.. its not ricy to turbo a car just because ricy cars have turbos on them.... i still think the M90 is gunna run out of steam on a DOHC V8... hell they run out of steam on a pushrod V6 (3800).. just my opinion...

                Compare the physical size of a N* and a 350, i think you will be supprised at how titanic the N*/4L engine is.. HUGE heads and HUGE came tower ontop of the engine.. physically large compared to a pushrod V8... but if you can get it in there more power to ya... its gunna be a nightmare to work on if anything needs fixed...

                i do like the N* engines tho


                S
                Shane "RedZMonte"
                2004 Corvette Z06 Commemorative Edition -VIRGIN
                1995 Monte Carlo Z34 14.38@101mph, 331hp/355tq
                -Turbonetics T04E Super 60 Turbo, 2.5" Borla Catback, OBDII, 42.5# Injectors
                2004 Subaru WRX STI -Lightly Modded (SOLD)
                1994 Lumina Z34 -VIRGIN (SOLD)
                1992 Lumina Z34-VIRGIN (RIP)
                1992 L67 Lumina Z34 (SOLD)
                1990 Turbo Grand Prix (SOLD)

                Comment


                • #9
                  interesting picture, but is that a m90 or m112 or what on that northstar?

                  and does anyone else find it odd that the headers are pointing toward the front of the motor? what the hell application is that for?
                  1995 Monte Carlo LS 3100, 4T60E...for now, future plans include driving it until the wheels fall off!
                  Latest nAst1 files here!
                  Need a wiring diagram for any GM car or truck from 82-06(and 07-08 cars)? PM me!

                  Comment


                  • #10
                    EATON M90'S RUN OUT OF STEAM WITH 3.8 2 VALVE ENGINES? wow thats awful! that almost makes me wanna just go N/A for now & put together a twin m90 setup with each one pumping directly & the shortest path to the valves as possible (without spending buttloads of money lol), compared to the price of larger superchargers, if my machinist buddy can fab me up an intake for a decent price, itd more cost effective (i can find m90's for $150-$200 pretty easily, but larger chargers run 700-800 bucks! if i went this route-how the hell would i setup the vaccum lines considering id be using dual TB's? either way it doesnt matter a whole lot to me-i got a buddy loaning me his 370z for a year while hes in iraq starting at the end of this month so i can certainly take the time to put this RX together nice so its ready when i give the Z back & i can whoop him & make him wonder where the extra $30,000.00 went LOL

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                    • #11
                      take a read(look actually):



                      thats the gen V M90...



                      thats the m112, i believe they were found on F150 Lightnings...



                      check that out as well: its a "simulator" to determine what supercharger from eaton would work best..
                      1995 Monte Carlo LS 3100, 4T60E...for now, future plans include driving it until the wheels fall off!
                      Latest nAst1 files here!
                      Need a wiring diagram for any GM car or truck from 82-06(and 07-08 cars)? PM me!

                      Comment


                      • #12
                        i just did the sim, and here's what i got:

                        SuperchargerPower 39.484 kW 68.194 kW
                        EngineSpeed 4000 5200
                        SuperchargerTorque 43.843 Nm 58.248 Nm
                        EnginePower 218.798 Hp 264.272 Hp
                        NaturallyAspiratedPower 137 Hp 160 Hp
                        NaturallyAspiratedTorque 243.891 Nm 219.105 Nm
                        EnginePressureRatio 2.62 3.06
                        EngineTorque 389.51 Nm 361.896 Nm

                        this is for a small port 3100 with a m90...
                        and i included a pic for toque since i don't know Nm... and the pressure ratios seem to say that it certainly isn't too small for a 3100...

                        and this is all with a 50% efficient intercooler...
                        Attached Files
                        1995 Monte Carlo LS 3100, 4T60E...for now, future plans include driving it until the wheels fall off!
                        Latest nAst1 files here!
                        Need a wiring diagram for any GM car or truck from 82-06(and 07-08 cars)? PM me!

                        Comment


                        • #13
                          thanks a bunch man-ive been looking for that info for the m90 for quite a while now! you dont happen to have any charts like that for the garrett turbos do you?

                          how would you do that sim for the 4.0 32 valve v8? i dont know if its not working for me but it only lets me run numbers for 2.0 dohc engines & then i dont know what info to put into the calculator
                          Last edited by no_doz; 06-04-2009, 07:07 PM.

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                          • #14
                            i don't, but squirrel performance does.... and their calculator is pretty nice

                            squirrelpf.com or something like that...
                            1995 Monte Carlo LS 3100, 4T60E...for now, future plans include driving it until the wheels fall off!
                            Latest nAst1 files here!
                            Need a wiring diagram for any GM car or truck from 82-06(and 07-08 cars)? PM me!

                            Comment


                            • #15
                              lol Twin s/c... M90's would be something like this

                              Last edited by RedZMonte; 06-04-2009, 08:08 PM.
                              Shane "RedZMonte"
                              2004 Corvette Z06 Commemorative Edition -VIRGIN
                              1995 Monte Carlo Z34 14.38@101mph, 331hp/355tq
                              -Turbonetics T04E Super 60 Turbo, 2.5" Borla Catback, OBDII, 42.5# Injectors
                              2004 Subaru WRX STI -Lightly Modded (SOLD)
                              1994 Lumina Z34 -VIRGIN (SOLD)
                              1992 Lumina Z34-VIRGIN (RIP)
                              1992 L67 Lumina Z34 (SOLD)
                              1990 Turbo Grand Prix (SOLD)

                              Comment

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