Cam Ideas

[xLeGeNDx]

I have a rather stock 3.1L (Vin T) with a 2.5" exhaust all the way from the cat. The car is a 1992 Pontiac Grand Prix SE.

I'm looking to get a little more out of it and thinking about going with a cam. But before I do the cam I'm doing a LG8 head and intake swap with 1.6 ratio'd rockers and a 56mm TB.

and left wondering what kind of cam I should go with.

[geoffinbc]

First here is a list I have compiled of every 660 cam I have found. http://members.shaw.ca/betterthanyou...haft_guide.htm

I would stick to a cam in the 260* advertised duration range. It will be streetable and will idle well. Other specs on the cam will determine where the torque is in the RPM range and the total torque the cam will make.

[xLeGeNDx]

Thanks for the guide.

Comp Cams 260H (1000 to 5000RPM)
Crower Cams 260FDP (2200 to 6000RPM)
Lunati Cams HI-260 (1000 to 5000RPM)

If to my understanding of the chart you gave me then these 3 cams are in the 260* advertised duration range. For my specific application is there any pros/cons over these 3 cams?

I do like however that the Comp Cams 260H grind has a lope and is yet streetable, afterall I will be using this car as a DD.

[geoffinbc]

I don't think the COMP one will have a lope. At least it has not been reported by anyone I have talked to who has it. The Crane 272 cam does have a bit of a lope at idle.

However of those 3 cams the Lunati and the COMP are almost identical. You would never be able to tell a difference. I would not use the Crower cam it is a solid lifter design. The Crane 260-2 cam is another good choice. A lot of people I know with S-10's have chosen it and they say it performs VERY Well on the street. Just a tip. GM sells the same cam but usually at a cheaper price through your GM dealer in the performance parts catalog.

[xLeGeNDx]

From what I was reading from the Comp cams website in the description it said that, that particular cam did have a lope, but i would prefer what the people who own and use the cam say instead of going by a website description. Would the 260-2 be a good choice paired with some LS6 Valve springs? When it comes to cams and valve springs im a little clueless on whats going on when pairing up a good match.

[geoffinbc]

Well on COMP's site you will find a number with a K kit which will have a complete set of valve train parts. Including springs and retainers. If you want the beehive style spring then a set of LS1 springs would be just fine.

[xLeGeNDx]

Thanks for the help, I think I'm going to go with the 260-2 grind from Comp Cams.

Since custom pushrods are needed for stock cam on the Hybrid build I'm doing, Will I still need custom pushrods? or will I need the pushrods recomended to use with the new cam?

[geoffinbc]

You will need custom ones.

[xLeGeNDx]

alright thanks and one final question

I was thinking about getting some 3100 pistons while im at it for the build, if I used the 3100 pistons over my 3.1L pistons my compression should be slightly higher correct?

[z284pwr]

Does anyone have any experience with any of these cams on turbo motors? We think the cam went flat on our custom grind in our TGP.

Here is the cam: http://www.edwardsracing.net/off_topic/cam.jpg and it made HORRIBLE low-end, it didn't have much of power until 2800-3200 RPM even with the stock turbo. It was originally chosen to be a "turbo" cam, the EGTs are pretty damn high it puts out.

The engine is a full build with an FAxx 2700 RPM stall and we have a GT3076R turbo on it now with a Haltech E6K. I've always heard good things about the H-260-2 on the 3.1s but I would like to have a bit more top end power. The next choice one I considered is the H-272-2. Some say it may be a bit to extreme for the street and it may not be as easy to tune, obviously this isn't a concern with the Haltech. I'm looking for something that will give a boost in low-end while still keeping the top end. The current cam, while having terrible low-end, works wonders with the turbo as it spools at a high enough RPM it's not instant wheel spin/transmission destruction.

[Superdave]

alright thanks and one final question

I was thinking about getting some 3100 pistons while im at it for the build, if I used the 3100 pistons over my 3.1L pistons my compression should be slightly higher correct?

Yes, the 3100 pistons will give you around 9.5:1 or so.. or you could just run thinner headgaskets and get around 9.4:1.. but you can't do both.

i'd pick the gaskets since they'll be cheaper than finding a set of good 3100 pistons. Have the parts store look up a set for a 3.1 camaro. they are .040" instead of .060" conpressed.

[geoffinbc]

Does anyone have any experience with any of these cams on turbo motors? We think the cam went flat on our custom grind in our TGP.

Here is the cam: http://www.edwardsracing.net/off_topic/cam.jpg and it made HORRIBLE low-end, it didn't have much of power until 2800-3200 RPM even with the stock turbo. It was originally chosen to be a "turbo" cam, the EGTs are pretty damn high it puts out.

The engine is a full build with an FAxx 2700 RPM stall and we have a GT3076R turbo on it now with a Haltech E6K. I've always heard good things about the H-260-2 on the 3.1s but I would like to have a bit more top end power. The next choice one I considered is the H-272-2. Some say it may be a bit to extreme for the street and it may not be as easy to tune, obviously this isn't a concern with the Haltech. I'm looking for something that will give a boost in low-end while still keeping the top end. The current cam, while having terrible low-end, works wonders with the turbo as it spools at a high enough RPM it's not instant wheel spin/transmission destruction.

That cam has a nice wide LSA for making power with boost. But you may be experiencing poor low end torque because of the installed intake center. Advancing the cam should help.

[xLeGeNDx]

Yes, the 3100 pistons will give you around 9.5:1 or so.. or you could just run thinner headgaskets and get around 9.4:1.. but you can't do both.

i'd pick the gaskets since they'll be cheaper than finding a set of good 3100 pistons. Have the parts store look up a set for a 3.1 camaro. they are .040" instead of .060" conpressed.

I might have a line on a set of good 3100 pistons buut im using the term might loosely, I'm assuming since the application is a 3.1L in the camaro that the head gaskets are the exact same as mine but only thinner? what years of the camaro got the 3.1?

[torq455]

bad low-end with those cam specs surprises me. the LSA of 115 is great for boost. yeah, the intake installed angle seems low to me. the Crane 272, i've heard people say it has a nice lope to it and in a gasket matched, 9.8 CR, and P&P 3.1 makes tons of lowend torque. however, the top-end was maxed at 4500 rpm. Headers brought the peak up to about 5500 rpm. the CompCams 260 is a very good all around performer, and has not a lope per say, but an idle characteristic from what i understand. it's what got Collin's 3.1 hybrid to break into the 13's.

[xLeGeNDx]

What all does he have done to his hybrid?