PUNISHER TA

iTrader: (13)

I was reading today that the longer stroke is not boost friendly...

Im running 4.185 bore 4.125 stroke in my LSX block. N/A

When would you expect this long stroke to become an issue?



The engine is a HKE built 454, LSX block, compstar crank/rods, wiesco pistons, 11.3 SCR.

Im running E85 in it right now, and will continue to run it.
This will remain a full weight street car for a while..

Just looking for something to play with on the highway/mile racing.


Any guesses on how much power this setup could handle? with what size turbo(s)

Cronic_Moronic

It creates a lot of side loading on the piston skirts.

Personally I wouldn't boost it at all. I would sell the 454 and build something more boost friendly.

PUNISHER TA

iTrader: (13)

As a result of the longer stroke?

What do most people aim for on a turbo build 4.0? that doesn't seem much different...



For arguments sake (I am a senior in college, and have worked hard to get what I have, but wont be able to replicate this engine build AND turbo setup for a couple more years...)

Lets say my options are:
Maximize it N/A (~650+WHP)
or
Turbo this setup (Easily more than 800WHP)

venom ws7

iTrader: (13)

I'd go with maximize N/A if it was my choice.
it's really not worth going with turbo/twin turbo setup + fuel system if you're planning to run it safe and be scared everytime you go WOT.
Keep it N/A and add 200shot (of course the pink 10bolt is a must replace ) you'll be over 800rwhp easy.

Good luck man.

PUNISHER TA

iTrader: (13)

Im not sure what you mean by "planning to run it safe...."

I will run this thing into the ******* ground, I am by no means scared to kill it, thats not what I meant at all.

Honestly, I just HATE selling stuff(dealing with buyers), so I would rather boost this, blow it up and then rebuilt it to a more boost friendly setup.

I just don't want to be COMPLETELY MORONIC and run like twin 115s... so im just looking for a little direction.




and yes the pink 10bolt with be swiftly replaced with a PINK 9"

PUNISHER TA

iTrader: (13)

Also, I would love a 1200-1400WHP setup, if it could be stretched out of this engine, I just to decided to keep that out the the post, so this thread didn't turn into a bunch of people telling me that I am retarded and that that is impossible.

If I can't get enough input here, I will probably build
1-7/8" primaries -> 3" collector -> T6 flange -> 115mm precision turbo
3" charge pipe-> A2A -> A2W
and see what I can do.


Speaking of, has anyone ever ran both an A2A and A2W?
this is a street car, but I would love to have an A2W to support my higher boost goals...

Cronic_Moronic

It's a result of the longer stroke, I think the 4in stroke engines have the same issue. I'm not sure how much of a problem it is but for me I dislike the enough of it enough that I wouldn't build a long stroke LSX engine.

There are several reasons that most who build turbo engines usually stay smaller than 454.

MR2liter

iTrader: (11)

I think your biggest issue with boosting your motor will be the thin cylinder walls of the 454!

TheLS1Lover

Its not a good idea to boost your motor because of the bore, not the stroke. The cylinder walls are too thin in a 4.185" application, and crack.

1 3/4" Primaries - 2 1/2" Collector - 2 1/2" Crossover - T6 Flange - and a 94mm and you're set. A 116mm Precision would not be that fun for a street car.
3" Cold Side is not that big at all. At least 3 1/2", and an A2A can be done, but make sure its a good one. I.e. Garrett, Bell, etc.

What Cylinder Heads are on the car?

jbhotrod

x2, the cylinder walls are too thin and theres stronger blocks out there than the LSx. If you could take it down to a 427(with forged internals of course) I really doubt youd see/feel any difference in spool or response. I think a single 98 would work perfect with a street 427 without choking it up. What trans will you be running? With the right converter a 106mm is also definitely plausible for 427ci. IMHO twins always turn out better though and with any V8 engine, if it was up to me Id have twins on it.

Theres definitely some bad single setups out there. Dan Millen, Mike Murrillo, and Andy Jensen are just a few that have shown a big single on a small block is still fast.

Scoggin Dickey

iTrader: (34)

Absolutely do not boost a 4.185 bore LSX block. It's a pretty killer block when set up properly for whatever it's being used for, but 4.185 is not set up for boost.

PUNISHER TA

iTrader: (13)

Alright, no boost...

Guess Ill have to live with old lady amounts of power for now..


Who could have guessed I would get bored with this power so quick...