357ci HP Estimations
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From: Dexter, Oregon
357ci HP Estimations The engine still isn't complete, but here's where it stands right now:
Eagle 4340 3.50 stroke crank, SRP Professional light weight pistons and K1 6" H beam light weight rods (with everything balanced), that rounds out the rotating assembly with some splayed caps. We also have the block bored .030 over and squared the deck with .045 quench. We're estimating the compression to be around 11.78.
Top side, the H/C/I are coming from Lloyd Elliot. The heads are 205cc LE2's and the cam specs are 236/244 .579/.578, 110 LSA.
With all the supporting mods, I would like to think it could make around 450rwhp, but what kind of numbers would you guys expect from this engine?
Thanks in advance
Eagle 4340 3.50 stroke crank, SRP Professional light weight pistons and K1 6" H beam light weight rods (with everything balanced), that rounds out the rotating assembly with some splayed caps. We also have the block bored .030 over and squared the deck with .045 quench. We're estimating the compression to be around 11.78.
Top side, the H/C/I are coming from Lloyd Elliot. The heads are 205cc LE2's and the cam specs are 236/244 .579/.578, 110 LSA.
With all the supporting mods, I would like to think it could make around 450rwhp, but what kind of numbers would you guys expect from this engine?
Thanks in advance
Last edited by 4genPhoenix; Apr 4, 2013 at 10:37 PM.
The quench is a little wide for my tastes so that will cost you a bit of HP there.
On a 355 with that combo I would estimate 400-410whp through a 6-speed, 390whp or so through an automatic. You're going to need some revs to make power with the smaller displacement.
On a 355 with that combo I would estimate 400-410whp through a 6-speed, 390whp or so through an automatic. You're going to need some revs to make power with the smaller displacement.
I've got a setup similar to that, LE2, 355 forged scat 6" rods and srp pro series pistons, 236/244 .594 lift 112lsa bullet cam, .039 quench and 11.8:1 cr may bump it to 12.0:1 with some .035 cometic gaskets sometime... I haven't dyno'd yet, I will right after it's back on the road in a few weeks, cash has been tight lately... Probably right around what RamAir said for the both of us. But we'll see the numbers soon. Pulls to 6800 on the base tune, I'm guessing higher yet once dyno'd.
The 3.5" crank over the stock 3.48 is your added 2 cubes, I know I'm stating the obvious but most people associate .040 as a 357. 450 is not gonna happen, I'm gonna agree with joe about his guesses.
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Hmmmm, If it atleast runs 11's I'll be happy. Thanks for the quick replies, I'll be sure to post some numbers when we eventually get it on a dyno.
Last edited by 4genPhoenix; Apr 5, 2013 at 09:25 PM.
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If your going for 1/4mile times with a properly dialed in set up, and I mean really dialed in, you could be hitting low 11s and possibly really high tens with some fine tuning.. Just assuming though, so take it with a grain of salt.. The guy who had my heads and cam package before me got in the 11.2s but with a 383.
Is your cam lift that you posted with 1.5 or 1.6 RRs?
Is your cam lift that you posted with 1.5 or 1.6 RRs?
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400-420rwhp through a m6 and 10 bolt, 370-390rwhp through a 4l60e and 10 bolt, pretty much like joe said.
Any reason you went small on the stroke? I don't see much much point if you're buying a new crank to stick with stock or stockish stroke unless you're class restricted.
Any reason you went small on the stroke? I don't see much much point if you're buying a new crank to stick with stock or stockish stroke unless you're class restricted.
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@96capricemgr: Lloyd Elliot, and what we're bolting his stuff to.
@FormulaJoe: I'm not sure, I was under the assumption Lloyd bases all his numbers on 1.6 rockers. I got the specs i posted straight off of his site; the last one he has listed. The engine will have 1.6rr's in it though.
The car's a little heavy, around 3600-3700lbs with me in it, but the drivetrain will have no problem handling hard launches on slicks (m6 car). I'll have all season to dial it in so we'll see how it goes.
@Rob94hawk: We don't have the gaskets yet, but we plan using MLS Felpro
@myltwon: Durability at higher rpms, keeping about .020 on the deck, rod to stroke ratio and we feel it matches the H/C/I that we will be using better. Plus if we wanted to make a real fire breather we would have started with a 396 and gone from there. This thing is going to be street driven quite a bit.
@TravisMcGill2000: The quench should be fine, the head gaskets are .041 and the piston is .005 in the hole
Sorry I haven't elaborated on the quench till just now, and for replying to everyone in one comment lol
@FormulaJoe: I'm not sure, I was under the assumption Lloyd bases all his numbers on 1.6 rockers. I got the specs i posted straight off of his site; the last one he has listed. The engine will have 1.6rr's in it though.
The car's a little heavy, around 3600-3700lbs with me in it, but the drivetrain will have no problem handling hard launches on slicks (m6 car). I'll have all season to dial it in so we'll see how it goes.
@Rob94hawk: We don't have the gaskets yet, but we plan using MLS Felpro
@myltwon: Durability at higher rpms, keeping about .020 on the deck, rod to stroke ratio and we feel it matches the H/C/I that we will be using better. Plus if we wanted to make a real fire breather we would have started with a 396 and gone from there. This thing is going to be street driven quite a bit.
@TravisMcGill2000: The quench should be fine, the head gaskets are .041 and the piston is .005 in the hole
Sorry I haven't elaborated on the quench till just now, and for replying to everyone in one comment lol
@myltwon: Durability at higher rpms, keeping about .020 on the deck, rod to stroke ratio and we feel it matches the H/C/I that we will be using better. Plus if we wanted to make a real fire breather we would have started with a 396 and gone from there. This thing is going to be street driven quite a bit.
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Not what I meant, that was my bad lol. What I meant was if we went bigger cube's, we would also go big rpm's. It would be very not streetable 
Last edited by 4genPhoenix; Apr 5, 2013 at 10:27 PM.
My AI 200cc heads/cam/383 drives wonderfully. Wouldn't hesitate to drive it every single day if I didn't have a DD, and I've got 50whp on your anticipated goals.
Too many people nowadays are concerned with "driveability" and go too tame only to wish they did a bit more.
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@TravisMcGill2000: We're still not sure where it's going to be. We haven't cut the block or bought the gaskets yet, we're just estimating right now.
@RamAir95TA: I know there are better, more manageable ways to go with any engine, but it all comes down to what I wanted to do.
@RamAir95TA: I know there are better, more manageable ways to go with any engine, but it all comes down to what I wanted to do.
Last edited by 4genPhoenix; Apr 5, 2013 at 11:04 PM.
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@96capricemgr: Just go to Lloyd Elliot's site, the LE2 heads are rated at 410+rwhp with a cam thats smaller than what i've got lined up for this motor, on a stock bottom end.
@fex77k: We're already at the limit of what the obd1 pcm is capable of, so if it becomes a problem, then we'll just do what we have to to make it work.
@fex77k: We're already at the limit of what the obd1 pcm is capable of, so if it becomes a problem, then we'll just do what we have to to make it work.
Last edited by 4genPhoenix; Apr 6, 2013 at 01:15 PM.