kpforce1

iTrader: (9)

Ok, looks like i'm ending up with a Comp cam that has the following:

224/224 .581/.581 108 LSA

I normally would go with similar type cam but with a 112-114 LSA. I'm getting this in a trade and the cam won't be upgraded for a long time. This would go in a stock motor with 918 or 921 springs and new pushrods. Any and every thoughts on the cam would be appreciated (tuning, drivablity, power under the curve, peak power/torque, etc.)... Personal experience with this type of cam or LSA is really what i'm looking for... Thanks

Engine is going into an 84 corvette with a 6 speed.

Patrick G

iTrader: (14)

That cam will be nice and torquey, just make sure you don't install the cam with any advance to it. As a matter of fact, you'll probably get more performance by running it a few degrees retarded. With 8 degrees of overlap at .050", it will have some good lope to it.

kpforce1

iTrader: (9)

I think that it has 4* advance ground into it as well and I was thinking of retarding it to a mechanical timing of 4* retarded. Alot of guys with the LSx type engines avoid tight LSA cams like that plague. lol There isn't any reason to be scared of the "rump rump".

s346k

iTrader: (4)

i have no intentions of hijacking this thread, however, i have asked many cam grinders and in general on this forum...what about a large cam, say the t-rex...on a 108? or something larger, say 244/250 on a 108+0 (maybe 1*) with ~.600 lift? i am trying to custom grind something like the larger of the aforementioned, but no one has offered any insight. i see no problem with it, as i will have a 4400+ stall. the car is a toy, not daily driven, nor do i ever have to depend on it for transportation. i like the 110 lsa, but it seems that 108 would be more suited for the track, which is what i want. i don't give a damn about driveability or anything associated with it.

kpforce1

iTrader: (9)

I can tell you for certain that you will have some mad overlap and it will like 3800+ RPM area... did i mention you would be the earthquake idle category? lol With a duration like that on a tight LSA that thing will rumble something nasty! I'd like to hear it. I don't think you would want to advance the cam at all though.

s346k

iTrader: (4)

yeah, my tuner would slowly begin to hate me as he tried to get a cold idle dialed in. but really, how come no one has any cams on a 108 lsa? is my logic wrong, what am i missing? theoretically the 108 would give the engine more peak power than a 110, but the curve would be peakier. ok, i'm only interested in the 5-7k range, as that is where i'd be almost all of the way down the track. and with mad duration like that, it *should* carry good hp after peak, correct? so from 5-7k it would f'n scream. so theroretically it would have more hp @ peak than a 110 and be somewhat flat for about 5-600 rpm. i have a bad feeling that i'll be first one to answer my question of "what am i missing"..but by then i'll be replacing my stock tranny from repeated shifts at 7k

kpforce1

iTrader: (9)

This is your tuner lol I think your idle will need to be 1k or so unless you put a vaccume canister in. The primary reason no one has narrow LSA's id because they think that the tuning is impossible or something. I mean as soon as someone mentions a narrow LSA on a forum people damn near condem it most of the time. lol Most are scared due to what "others" tell them and don't want to chance something that isn't as common as the 112-115 range. Wider LSA's broaden the torque curve more but will give up more peak power.

With your cam i'm assuming that you either have some decent heads/exhaust or have larger cubes (or a combination of all of them). As long as you watch the the A/F ratio across the board and have a good tune, making power after peak shouldn't be a problem... you will be making some pretty good numbers with that type of cam if you have some supporting components.

1CAMWNDR

iTrader: (21)

It would seem to me if you are primarily interested in power in 5K-7K rpms you need a cam with more duration. I'd say 230° ish .600" ish and on a 110° LSA straight up.

kpforce1

iTrader: (9)

I think he would be happy with 24x/24x duration and .600" ish on a 110*LSA. A little lopey and will pull very nice from around his stall speed on. Tuning would be a little easier with the 110 over a 108. I'm sure you will find something s346K.. just keep searching. lol

Patrick G

iTrader: (14)

You guys are only looking at LSA, that's just part of the picture.

A 224/224 108LSA cam has less overlap than an 232/236 112LSA cam, so it will lope less and idle easier. Overlap is what makes a motor difficult to tune, not the narrow LSA.

FWIW, a 206/212 106LSA cam would be smooth as butter compared to a 232/236 112LSA cam.

kpforce1

iTrader: (9)

I agree and i'm glad you mentioned it. Thanks

s346k

iTrader: (4)

i was thinking 244/250 .605/.610 on a 108+0...if i wanted something on a 110 lsa i'd get the t-rex.

i reckon i could order the t-rex on a 108+0...but i want bigger.

i think my bottleneck will be the ls6 intake...i will be using headers + true duals, ported ls6 heads, and eventually a th350 w/whatever stall fits my needs after i see a dynograph...

fast idles don't scare me, every v8 i've owned had a nasty cam that required a 1k idle.