ws6-formula

I know this question has been beaten to death and I've done a lot of searching and reading but cant find any answers to my particular questions.

I am building an engine that will see 1100-1400 at the crank. It will most likely be an lsx block with diamond pistons and Oliver speedway rods. It will be paired with an f1a94 procharger.

I'm looking for a crank that will hold this amount of power but not go overkill. I've seen at least one magnum snout break with a procharger so I am ruling that out along with the compstar as they seem to tap out at about 1300ish (I understand every application is different)

What is a good forged crank that will work well in a procharged application? I would like to stay with the guys that use US forging. Basically something between a compstar and magnum? Does anybody have any thoughts on this? Ive also looked at the lunati signature series. Hoping to land in that $2-2500 dollar range.

Thanks in advance!

TheWrathofDan

most important. stay stock stroke.

ws6-formula

Why is that? I hope an lsx block with a good set of rods can manage at least a 4" stroke.

TheWrathofDan

long stroke = weaker crank at webs where blower load most likely to break. not to do with block or rods

01CamaroSSTx

iTrader: (3)

I'd want a premium set of rods and a premium crankshaft if i'm looking to make upwards of 1500hp. I'd consider a billet crank and billet rods if I was going with forced induction and big power numbers.

BCNUL8R

iTrader: (2)

I run a ls3 block with a stock crank and an f1a-94 spinning it to max recommended impeller speed with no issues.

ddnspider

iTrader: (26)

is your power up there too in the range of OP? I thought you said you were about 900. Not sure id trust a stock crank on a blower at 1400.

BCNUL8R

iTrader: (2)

So, if we are running the same blower running it at the same impeller speed with the blower maxed out do you really think one combo is going to make 1400 and another make only 900 without some major issues causing it to make 500 less hp. I'm easily over 900 to the tires through an auto trans based upon trap speed and weight. Little 377 with 10.6 to 1 compression 232/248 custom cam on e85 and meth injection with an f1a-94 spinning over max recommended impeller speed. 8.25 crank pulley, 4.12 blower pulley, shifting at 7200 rpm boost climbs all the way to 7200 rpm with no signs of slip.

ws6-formula

you’re talking about two different things. Nobody said this will make 1400 whp… I’m guessing an f1a94 paired with an lsx 4xx cube engine, Frankenstein heads, and e85 will touch 1100 whp which is close to your supposed 900 whp set up. Just looking for crank options and opinions here, not a pissing contest.

Pro Stock John

iTrader: (34)

Ask Jesse Coulter, he's been running the same blower for a while and been in the mid 4s for a while

www.facebo ok.com/jessiesautogarage

ws6-formula

thank you sir!

BigBoyWS6

If he stays stock stroke length, which will greatly limit the amount of cubes, won't it be impossible to hit 1400 crank with an F1-A-94? Bob at Brute Speed said the highest HP he's heard was 1500 crank from an all out fully built 427ci.

Build it right and any length stroke will stay together. The AMP Vette has an F1-X and it supposedly makes 1400 RWHP. Its stroked......

BigBoyWS6

The shop thats installing my new engine right now has a 99 Trans Am with a F1-A-94. Stock crank, stock cybes with forged rods and pistons. Makes just over 1,000 RWHP. Don't remember what kind, but good heads, sheet metal intake and I THINK full time methanol for fuel when he races it. Could be wrong on that I thought I heard him say methanol. Maxed out everything.

When I inquired awhile back about supercharging Steve Morris Engines told me a Pro Volute is good for another 80 RWHP, if you can find one.

So 1400 crank ain;t gonna happen unless its an all-out, higher compression, serious engine build.

Only reason I'm going turbo is because there's no way a supercharger of any kind that will keep my factory hood intact will make anywhere near my goals of 1200 RWHP. F1-X might, but that requires a complete radiator fabbing job, cutting and A/C might have to go, or be some custom condensor and fan set up.

BigBoyWS6

If stock cranks are proven to handle 1,000 (plus), than any forged crank should guarantee you a few hundred more. Get a Callies 3.825" crank. 10 years ago I found one by calling Callies directly and they had unfinished ones sitting on the shelf. It was at my house finished in about 10 days. I can't remember the price but it was cheap. I want to say under $1500. That crank is good to 1400 hp.

ddnspider

iTrader: (26)

I was scrolling on my phone on another continent so I didn't make the connection that you were both running the same blower. 900 to the tires isn't 1400 at the crank so I was curious if you would run the same crank at 1400 crank. Chillax.

TheWrathofDan

old search find this
https://ls1tech.com/forums/forced-in...k-support.html
https://ls1tech.com/forums/generatio...ft-pics-3.html

BCNUL8R

iTrader: (2)

I think you all are misunderstanding my post. The other guy said you were making 1400 crank and I was only 900 crank. My post was to spur discussion on how one combo would only make 900 crank and another would make 1400 crank with the same blower at the same impeller speed with neither combo having mechanical issues.

Cubic inches are only going to move the curve and have very little effect on peak hp numbers using the same blower at the same impeller speed. It's very possible one combo would make 100 hp more due to being more efficient, but 500 hp difference between the two combos would require one to have some very serious mechanical or ignition issues. The bigger cubic inch combo would make more torque and do it over a broader range but wouldn't necessarily make any more peak power. I know no one cares about peak power, but since those are the numbers being discussed here, I felt my comment was relevant to the discussion.

I'm deeply sorry I offended you as that was not my intention. My combo was specifically called out, so I wanted to clarify 900+ at the wheels and you were talking 1400 crank.

My car has not been on a dyno as I do my own tuning on the street and track. You can correct me if I'm wrong, but a 3750 lbs race weight trapping 125 mph in the 1/8th would suggest at least 900+ rwhp which is much more accurate of a guage than a dyno in my opinion.

BCNUL8R

iTrader: (2)

I think you misunderstood the point of my post. I'm sorry if I offended you. I fully understand that 900+ at the tires isn't 1400 crank. It's probably a good 1100 at the crank and I just wanted to clarify I was talking wheel hp when I mentioned 900.

I have not been on a dyno as I only tune on the street and track. Based upon a 1/8th mile trap speed of 125 mph at 3750 lbs race weight I think it was safe to say I'm over 900 rwhp based upon the calculators I use and that is a much better gauge than a dyno in reality as dynos are much more easily manipulated. It's probably a good bit more than 900 rwhp actually.

My comment was meant to spur discussion on how cubic inches don't have a big impact on peak numbers only the curve as in more torque over a broader range when using the same blower at the same impeller speed as long as there are no major mechanical or ignition issues.

Again, sorry for the misunderstanding and sorry for offending you.

ETA: I'm considering going to an F1x and yes I will continue running the same engine combo until it breaks and then build a new combo.

BCNUL8R

iTrader: (2)

Interesting to note that thread is 13 years old and the blower was using a cog setup. This isn't as common as people think. Nothing against throwing the best crank money can buy in it. I'd always recommend buying the best parts you can afford. There are also a bunch of stock bottom end and even stock crank forged rod/piston LS3's out there running f1a-94 blowers in the 1000 rwhp+ range without crank issues.

pete466ss

iTrader: (10)

I would use any quality forged crank from callies, crower, k1 etc. and a crank support. That should handle your build.

Here is a super trick, billet aluminum, front cover with crank support integrated into it. From down under, joe blow speedshop(great name right&#128513
Shes a beaut.