UNtil I have the fundage for my ATI D1SC, I was wondering how a blower cam would act in an N/A car. From a stock internal LS1.

I can do a Blower and cam w/out heads on a stock internal LS1. Would I see a HP gain? Doing the cam first, that is... Or would this not work out too well.

232/240 114LSA?

 

It will work fine (that's a good bit of cam though, you sure you want that much?). Typically blower cams are more similar to stock cams anyway (broader LSA, milder overall, and large exhaust bias) so driveability should be fine and you will still see a nice increase over stock. That's a decent bit of duration though, proceed with caution if you don't want to lose bottom end and driveability. Worst mistake many make is going with a cam that compromises streetability too much to be worth the small difference in top end. You don't need all of that, especially with the boost there helping you put out a flatter torque curve and plenty of top end. Different perspectives can be entered in the mix though, it would just be my preference to stick w/something smaller, like the 224/236/114 cam that's so popular (or the 218/230).....but that's cause I like torque and driveability (really the exhaust bias on many blower cams is overkill though)

Edit: Bleh ...on stock heads it would probably be really sluggish at low revs w/that cam. FWIW a custom cam is just about always best, as long as the designer knows what he's doing.

 

Hmm....I can get a cutom grind cam for cheap. since I can't afford the blower yet, I mind aswell get some cheap power.

Why is it that the blower cams have a longer exh duration? and some have such small INT durtion? is it due to the fact that it takes in more air anyway b/c of the SC? Are the lobe profiles not as agressive on a blower cam? I had a custom cam picked out but I had forgotten the specs on it... The 232/240 was a rough guess.

What about this one... 224/232 .581 .595 114 ...IMO, it'd be purfect.. Just need an expert's opinion.

 

the cam int duration doesnt need to be very big because your already forcing in plenty of air with the blower and the exh is usually alot bigger so you can get all that extra air out.

 

Whoever grinds the blower cam(s) will assume in most cases you are going to use a blower with stock(ish) heads. Stock LT1 heads (even stock LS1 to an extent) don't flow particularly well on the exhaust side compared to the intake side, so cam companies generally feel is it best to waiver on the side of probability (stock to mild-ported stock heads). So you wind up with a large exhaust bias and a broad LSA, when they may not really be needed. Best thing to do is have your heads flow-checked ...then have the cam spec'd out based on that and other variables ...like gear ratio, weight, tranny, intended use, etc. This is the way my engine designer approached things, and let me tell you ...this thing can light the Nitto DR's up from a roll in 2nd gear even with the blower removed.

....the 224/232 cam sounds much better FWIW

 

Woah! ....Nice... Thanx for the info...
dsmawd350.. That's what I was thinking of... Just couldn't find the words... Thanx for clarifying..

Sweeet... I'll have to send myself that info!

EDIT:...Oh, and uh... this is a daily driver.. I don't know if that would effect anything.

 

You haven't stated how much boost you are planning on pushing, that is a big factor in cam choice too. The more boost you push, the more need for exhaust bias in the duration and a broader lobe separation angle.

 

ok. I will eventually doing an LS6 Block w/ forged internals, 225 heads, LSX intake w/ 90mmTB. -Boost on that motor, I'm not sure of yet.

Untill I can get ALL that done, I'll be running the 6lbs boost on my stock LS1. I'm just looking for some cheep power for now. ANother $380 3 years from now, (or whenever the stock bottom end fails) will be fine..

 

I don't know as much about the LS1 heads, but I doubt you need a broad LSA and a lot of exhaust bias with no more boost than that. Probably something custom ground with a 112 LSA and no more than 6 - 8* of exhaust bias. I'm just approximating though, time for an expert to chime in ....anyone? I'm going to say something like 222/228/112 w/maybe a bit more advance than 4* ground in might work really well. I don't really know how to calculate effective compression ratio and "boost-effective" compression ratio. You want to target something like 8:1 ECR to be safe on pump gas w/that boost level, but I don't know how to calculate all of that. Rich K. probably does and another one who prefers to go unmentioned in here (he designed mine and he's really good).