well guess the 383 is out the window

 

Well with that 600 bills you canget a good set of drag radials. LOL. Decisions decisions. GL man



John

 

thanks...guess its 348@15psi should do the trick!

 

dude 348 is good, set that boost up with some good heads, and u got a good strong engine so set that limeter to 7k rpm and u'll rape all them little 6 banger supras in ur town well maibe exept that green one lol.

 

wait a sec why aren't you getting the bigger cubed motor? Your dynamic compression ratio is what really matters. Get a reverse split cam or something with a longer duration that closes a bit later ABDC. That will bleed off some of the compression and you should do just fine. That pressure "bleed" is just going back into the intake manifold; it's not like blow-by on a narrow lobe separation angle cam.

Your engine builder doesn't know all this stuff???

 

that would drop the CR almost ,6 or ,7 of a point?!

 

easily.

Suppose you had a static compression ratio of 9.5:1. Take a standard 224° cam that closes 66° ABDC. That would give you a dynamic compression ratio of 7.57:1 and on 15psi of boost, a 15.29:1 dynamic boost compression ratio, which is a little high.

Change to a 236° cam that closes 72° ABDC. your dynamic compression ratio drops to 7.21:1 and your dynamic boost compression ratio (with a 15psi charge) is down to 14.57:1.

To make it nice and easy to tune, I'd get something like a 238° / 224° on a 116° LSA with an intake centerline of at least 116°

 

this is for a turbo application, right? Turbos love reverse split cams.

And you don't have to grind a long duration intake cam to get this effect. Just moving the intake valve open event (thus the intake centerline) to a later angle and widening up the lobe separation will have the same effect.

like a 228 / 228 on a 118° LSA and 118° ICL

 

ill look into it but i dont want a big cam seeing as how its my DD.and id need the CR to be about 9:1

 

sounds like a stroker is too complicated for you and your engine builder. just build a 348.

 

Hmm.. well hopefully I can find someone to buy a engine from.

 

I don't know what to say guys but one more time:

http://www.latemodelengine.com/

Give Bryan a call, he knows what a stroker is

 

ive already paid half up front and the company stays in contact w me.the companies talked to him as well he's just waiting to hear back about giving them the half up front himself.no biggie.if LME was offering a better price we would have gone with them.

 

I still don't see why you can't go lower on your piston dish. Why does it have to be 9cc's? How come you can't get 15cc's or 30cc's if you wanted? It might cost you a few bucks more, but who cares if you can get more cubes? If it were me and I wanted to run 12-15psi, I would use:
3.905 bore
4.00" stroke
.040" head gaskets
-.003 deck height
15cc dished pistons
72cc combustion chambers
This nets 9:32:1 compression. You should be able to easily run the amount of boost you want with that. If you want lower compression, a 16cc will get you 9:1:1, and a 17cc will get you 9:0:1. Any piston company should have these pistons ready.
When it comes to cams, in a turbo/stroked application, you low-end power is going to be overwhelming. I would deffinatlly steer away from "hard lobes" like the XE-R's. There is no need in running a lobe that hard when the power is already there. Save yourself some work, money, and time and get something along the lines of a XE lobe. Personally, I'd call Futral and have them grind you one to your application. I'd say something around a 228/224 115LSA would work nicely and be very streetable.

 

Well, I am going to have to go with a custom piston. So I can pick what ever CR I want.

But I have no idea what to get between 9 - 9.5 ???

I am running a Procharger P1 with 50 or so shot of Nitrous.

Any help here?

 

yup i did the same,9:1 for me.

 

What blower you have? I don't think my P1 can push enough air to drop the CR that low.

 

i dont have a blower im turbo'd i have a phamspeed kit,with a T67 as of right now but im going to need to upgrade in the future cause the poor turbo cant handle a forged 383.im curious how my GT2-3 cam would do with that setup or if i need a bigger boost cam.

 

Ahhh....

A bit bigger wouldn't hurt. My 224/224 114 seemed to work decent. I think I want to go to something like 224/227 114

 

im thinking of either stick with this cam go big like 228/228 116