Pro Stock John

iTrader: (34)

3.27 crank from a 4.8 engine.

I just threw one away. PM me if you want some folks to check to get one. I think you'd pay $100-200 for one.

FASTONE

Like was mentioned you could turn down a 3.27 stroke crank(offset grind) to 3.17 and use 2.00 Smallblock Chevy rods.Also with the reduced stroke you will lower your compression considerable( probably low enough to turbo).Your valvetrain is where you better spend some money too! I think you"ll have way more then 600 hp if its set up right,still think its a bad idea,you can get 600 hp natural with a 5.7 ls1 and way cheaper.

maddboost

iTrader: (11)

Why do you want to destroke it except to make it rev higher? What are your goals with this car are you racing in a specific class or trying to achieve a certain 1/4 time? I would just go with a forged 348 motor. Many people have gone very fast with them in forced induction setups.

427

iTrader: (3)

Callies has a short stroke crank coming out. I think its 3.185 stroke. Makes 5.0 litre with std 3.9 bore.

Kurt

z98

Um, rod bolts anyone?

Also, this is a bad idea.

You won't gain anything by going to a smaller bore. The limitations inherent in the design of a pushrod engine will be the limiting factor way before piston speed will be.

Lostpatrolman

iTrader: (3)

I dont see why you guys are worried about him wanting to rev a few Ks over. There are small blocks at the tracks currently running 10-12k rpm. As long as the engine is set up, it should hold up. Might want to get girdle also though. Although, when you say you are using the car on the track, do you mean dragstrip or autoX? If it is autoX, you should definately think about lowering that rpm limit. Not sure how even a strongly build ls1 would like taking 9k of extended usage. It would be cool though.

AM2

the only reason to have more rpm is to have more usable powerband.....less shifts....higher rpm.....thats it.

i am figuring out this may not be something to look into.

Pro stock john - 100 - 200 dollars? wow i thought it would have been WAY more than that. like 2K for a good forged crank. pm me the details please.

but this car will never be autoX mostly open tracks....in particular VIR (virginia International Raceway) may or may not be trailored there. i dont know yet.

but again the whole reason for this is to have power for more than 2K rpms (from 4-6K) i would like to have power from 4-8K if possible. that is the reasoning i have right now. if you guys know how to make 500-600hp at 2K and hold it to 6K i am all ears

but i also dont want to rebuild the valvetrain every night after an event.

thanks

Drew

Pro Stock John

iTrader: (34)

No a stock 3.27 crank is cast not forged. A forged crank is typically over $1500.

AM2

oh ok i must have read the post wrong...thats more what i thought. you think a fully forged rotating assembly is required for this? forged crank?

Pro Stock John

iTrader: (34)

If you want to rev to 9K you would need a forged crank and other stuff. Titanium valves to keep the weight down of the valvetrain.

z98

600 hp at 2k? Good luck with that.

Realisticly, you'd only need your power from 4500-7500 in a drag car.

777

iTrader: (21)

this to me seems like the dumbest idea i have ever heard of...i don't understand why anyone wants to rev the engine to 8k...you say so you have a longer power band...i don't think you can create a longer power band...you can shift them...but i doubt you can double your power band...rx7's rev so high because they have to make up for the lower displacement...this way they can spin the turbo at the same speed...since the turbo runs off of gases and not rpms a v8 will create as much exhaust gas as a 4 cylinder (or rotary in your case) of half the size at twice the rpms....secondly you can have an engine that is 500% more reliable and make the same power and the same times without destroking and whatever else you are talking about for less money...just get a forged 347 and throw a turbo on it if that is what you are wanting..."long gears" wouldn't be good for any type of racing if you ask me...except top speed i guess...but even then not a good idea in my book.

AM2

z98 thats my point. 600 at 2k is not realistic.

777 thanks man you are very knowledgable :sarcasm:

you obvisouly dont understand why. fine by me.

but i know that if you have power from 4-8 its better than 4-6....now please tell me why you would NOT want that.

dumbest idea ever. lol you people.

z98

Why do you need such a long powerband?

BIG STALL.

You'll stay within a very narrow band your entire run.

End of discussion.

AM2

entire run? hurm....this is a ROAD COURSE CAR not a drag car.

end of discussion...

why would you NOT want such a long powerband? whats NOT good about it, please tell me.

rons 00z

iTrader: (10)

for some reason the ls1 guys dont really like d stroked motors. even though an all bore would be considered a d stroker. you could always biuld one of those. get a block resleaved (think the new bore size is 4.1 something) and a stock stroke forged crank with a good topend and you'll be able to spin the **** out of it with 388ci then with the turbo you'll be making tons of power probably more than you'll need. for something like that you should get a bare cast set of AFR heads then have some one port those out and machine it for all you titanium parts.

777

iTrader: (21)

you obviously seem to know what you are talking about...so why are you asking questions..why don't you just stick to your rotary if you want to rev so high...personally i would rather have the power from 3-15...why can't i just do that

AM2

oh lord 777 is back.....man you are so closed minded.....people like you are so ridiculous....the RX HAS NO MOTOR SO GET OVER YOURSELF.

I am not a rotary head i could care less what motor the car has in it. if the rotary could be as reliable as the ls1 i would use it.

777 the term mullets and f-bodies became brothers because of you LOL........idiot.

777

iTrader: (21)

well the rotary is more reliable when you rev it to 8k



i'm sure you will be the only one laughing since that is not funny...

i'm really not trying to be a jerk but there is no point in revving an engine like the ls1 that high...if someone can prove to me that there is a benifit to that then i'll be completly fine with that...

the main point im trying to get across is if you put an ls1 and a turbo in your rx-7 it will be one of the baddest cars i have ever heard of...but there won't be any "real" advantages of you revving so high...other than the fact that you can say that you have an ls1 that revs to 8k

AM2

LOL.......thats why i came here, is to find out.

but you want to bash me for asking and comment 3-15 why can't i do that..............hahahahahahahahahahahahahahahaha haha but its not funny, its dumb.

just ask yourself what would you benefit revving your ls1 to 8K?

but im sure you would gain nothing...because its stupid........LOL