If things can go wrong it will, and it has. Enge evnts 2Date

[XLR8ING]

HAHA.....my dual intake rears it's butt ugly head!!!
My twin TB set up was very, VERY touchy!! It would bog, then go like hell!
Alot of that was due to the fact that the first TB started opening a split second before the TPS (which was mounted on the second TB) started moving. So really, it was getting air, and no extra fuel.
If you figure out the area though, two 52mm throttle bodies I think is actually less than one 70mm, but I don't wanna do the math! I did do it once, and I think it was equal to one 68mm TB.
My honest opinion is our engines don't NEED a 70mm TB, BUT bigger TBs do definately help throttle response, and improve power as you do more mods to a motor. I'm not one to argue a damn big TB.....I'm using one from an LT1 now!

Bigger TBs on port injected engines will never hurt power, like some of my customers used to tell me. Of course these customers were the old school guys that think a throttle body replaces a carb, so it must use the same principles.

[bszopi]

Area of a 52mm circle is ~2124mm^2
Area of a 70mm circle is ~3849mm^2

So... twin 52mm circles are equivalent to a single 73.5mm circle.

[torq455]

Well hell!! Franz, I guess you do need all those throttle bodies!! :P It just seemed the two 52mm's were quite a bit more than a 70mm. If you are going bigger, why not use the 70mm anyway?

[torq455]

I forgot....Yaayy Brad!! Thanks for the math!!

[gpse3400]

Got the engine apart today. Mains 2 and 3 are down to the copper and grooved pretty well. Mains 1 and 4 show some copper but not much, nice to know I was bending the crank. Two rod bearings show wear to the copper but its not too bad. The rest of the crank and rod bearings are in good order. Timing chain checks out though the damper shows some wear. Well I don't know....I guess I'll be using the stock pump from now on. Too much oil pressure was the problem as I'm sure the top end of my engine is well oiled. From what I know HV pumps are to be used specifically for remote mount oil fliter, cooler, or turbo charging. I will be installing a crank scraper as well. So I hope to gain some extra power from all of this! I have a good standard crank I'm going to use.Just need main bearings, I already have a set of rod bearings, timing cover gasket and an oil pan gasket and that should do it.

[1QUICKHATCH]

shitty. I hope you have some better luck with the rebuild!

[gpse3400]

Engine installed and runs. Driveway is blocked at the moment so I can't drive off, but all checks out. Fired up and ran first try. I will update when I can turbo boost over my brother's pos.

[Z2_4cams]

Area of a 52mm circle is ~2124mm^2
Area of a 70mm circle is ~3849mm^2

So... twin 52mm circles are equivalent to a single 73.5mm circle.

flow in a tube is an exponential relation to it's radius.

comparing surface areas does not work.

[robby1870]

Engine installed and runs. Driveway is blocked at the moment so I can't drive off, but all checks out. Fired up and ran first try. I will update when I can turbo boost over my brother's pos.

Glad to here that, Lorenzo. Cant wait for some numbers. Hope this one stays runnin' for ya! LOL

[gpse3400]

yeah thanks everyone. I've been relaxing and trying to not think of cars, they drive me crazy. Anyways Other than replacing the crank and installing the stock oil pump.... I have a SECRET!!!!!!!!!! This applies to 1 st Gen W cars with 3100's or 3400'sAnd 4T60E transmissions. This could also be adapted to 3.1s with 4T60e tramissions as well with alittle fanagling. OOOHH I GOT A PIC!!!!!!!!

I've deleted the 3100 engine to transmission support bracket. This is a TDC rear transmission mount and transmission to engine support bracket. This mated to the main engine mount give superior drivtrain stability. I thought about this because now my engine is making enough power to cause wheel hop at the 1-2 shift. By adding this setup, esspecially at the differential end I can keep the wheel hop subdued. NVH is not noticable except during start up. This set up is so rigid that the use of torque struts is not needed. In fact the engine sits so perfectly upright the torque struts are pushing the engine back!!! Most of the rigidity is due to the main mount being solid rubber. Well headers are now even more possible since you can run without the passenger side torque strut. To early W bodies 88-90 you'll need to refit your car with a subframe from '91+ in order to take advantage of this set up.

HE HE YEAH!!!!!!

[Rhedalert]

awesome!