Critique/help with this custom stroker combination
#907381
01/17/11 05:05 PM
01/17/11 05:05 PM
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Joined: Apr 2009
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mshred
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Hey guys,
Thinking of this custom stroker combination, tell me what you think
BPE 4.125" crank, 360 mains, uses chevy 2.00" rod journal
Inline 6 Chevy Scat H beam connecting rod, 6.00" length with the correct 2.00" big end diameter
Mopar stroker piston with a 1.46-1.465 compression height...Only piston I have found so far that is forged with a dish is the JE piston #207420 and it is quite expensive...cheapest ive found is flatlander racing for $786 for the whole set...the big stip with using the chevy 6 cyl rods is that they use a .927 piston pin, which in terms of the compression height i need, greatly limits me to just the JE stuff
So what do you guys think? Am i on the right track here? also, has anyone done a combination like this before and used a different piston/rod combo that still works with the 2.00" rod journal on the crank
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Re: Critique/help with this custom stroker combination
[Re: mshred]
#907382
01/17/11 05:27 PM
01/17/11 05:27 PM
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Joined: Jan 2003
Posts: 9,826 las vegas
70AARcuda
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With a deck height around 9.59 ...
you will need a compression height of 1.33 on your pistons.
Do the Math...
9.59- 6.20-(4.125/2)=1.325
Tony
70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
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Re: Critique/help with this custom stroker combination
[Re: 70AARcuda]
#907383
01/17/11 05:36 PM
01/17/11 05:36 PM
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Quote:
With a deck height around 9.59 ...
you will need a compression height of 1.33 on your pistons.
Do the Math...
9.59- 6.20-(4.125/2)=1.325
im using a 6" rod, not 6.125"
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Re: Critique/help with this custom stroker combination
[Re: mshred]
#907385
01/17/11 06:00 PM
01/17/11 06:00 PM
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Joined: Jul 2010
Posts: 2,091 Delray beach, Florida
Performance Only
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i agree with the above, get rid of the 6" rod for starters. we have the longer rods and matching pistons available.
machine shop owner and engine builder
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Re: Critique/help with this custom stroker combination
[Re: mshred]
#907386
01/17/11 06:06 PM
01/17/11 06:06 PM
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Joined: Jan 2003
Posts: 9,875 Weddington, N.C.
Streetwize
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I'd like to see you run a 6.2/6.25/6.3-ish" SBC rod, I wouldn't build-in a sub 1.5:1 rod ratio so long as there was an economical piston choice to make it work.
Also when you add those cubes you may need to go to a custom dish in order to get the cr you want.
I'd research AndyF's 427 motor, maybe you can run the same piston/rod as he did...it's in the small block tech archives.
I have a small block ford motor that is 4.04" x 4.17" stroke with a 6.123" mopar length rod....it's fine with the shorter RR....but the 351W deck is 9.5 vs 9.6 AND my motor is built to peak right at 5500 so I never take it over 6000-6200....by design....I wanted a 427FE type torque/power curve as similar to an original 65 cobra as possible.
Last edited by Streetwize; 01/17/11 06:12 PM.
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Re: Critique/help with this custom stroker combination
[Re: BPE]
#907387
01/17/11 08:20 PM
01/17/11 08:20 PM
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Quote:
The piston will not clear the counterweights at BDC. This is part of the reason for the 6.200" rod.
Hey Rod, thanks for that info! Im all new to this, so i was just plugging in numbers on stuff to see what I could come up with...now im starting to understand why you are looking to do an affordable combo kit for it lol
Any guess on how soon?
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Re: Critique/help with this custom stroker combination
[Re: Streetwize]
#907389
01/17/11 08:25 PM
01/17/11 08:25 PM
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Joined: Apr 2009
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Quote:
I'd like to see you run a 6.2/6.25/6.3-ish" SBC rod, I wouldn't build-in a sub 1.5:1 rod ratio so long as there was an economical piston choice to make it work.
Also when you add those cubes you may need to go to a custom dish in order to get the cr you want.
I'd research AndyF's 427 motor, maybe you can run the same piston/rod as he did...it's in the small block tech archives.
I have a small block ford motor that is 4.04" x 4.17" stroke with a 6.123" mopar length rod....it's fine with the shorter RR....but the 351W deck is 9.5 vs 9.6 AND my motor is built to peak right at 5500 so I never take it over 6000-6200....by design....I wanted a 427FE type torque/power curve as similar to an original 65 cobra as possible.
thanks for the info man! How do i calculate rod ratio? this is all new to me so im kinda figuring things out by trying to play with numbers
Also, the only reason I went to a 6" rod was because I couldnt find a piston and 6.2 or bigger rod combo that would fit in the stock deck...or maybe i wasnt calculating properly...guess i should go back at it
If anybody has done a combo like this and would care to share what they used, please share
im gonna check out andy's thread in the meantime
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Re: Critique/help with this custom stroker combination
[Re: mshred]
#907390
01/17/11 08:37 PM
01/17/11 08:37 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
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thanks for the info man! How do i calculate rod ratio? this is all new to me so im kinda figuring things out by trying to play with numbers Also, the only reason I went to a 6" rod was because I couldnt find a piston and 6.2 or bigger rod combo that would fit in the stock deck...or maybe i wasnt calculating properly...guess i should go back at it If anybody has done a combo like this and would care to share what they used, please share im gonna check out andy's thread in the meantime
I had Diamond change the pin height on my pistons and it was only $35 to change the height for the set when I had them made... that was just over a month ago... mine is a 416ci but with a deck of 9.53 (I believe it is... numbers are out in the shop)
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Re: Critique/help with this custom stroker combination
[Re: MR_P_BODY]
#907391
01/17/11 08:41 PM
01/17/11 08:41 PM
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Joined: Apr 2009
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Re: Critique/help with this custom stroker combination
[Re: mshred]
#907392
01/17/11 08:50 PM
01/17/11 08:50 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
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Re: Critique/help with this custom stroker combination
[Re: Quicktree]
#907394
01/17/11 09:15 PM
01/17/11 09:15 PM
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Quote:
you would be way ahead of the game to get with a builder and have them spec out your motor. save you a lot of trouble in the long run
your probably right about saving me the trouble, but ive always been the type to try and figure things out on my own...helps me learn something and save some money in the long run (i would hope)...Im only 21, so ive got a brain ready to soak in info, and a small wallet lol
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Re: Critique/help with this custom stroker combination
[Re: mshred]
#907395
01/17/11 09:19 PM
01/17/11 09:19 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
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Quote:
Quote:
you would be way ahead of the game to get with a builder and have them spec out your motor. save you a lot of trouble in the long run
your probably right about saving me the trouble, but ive always been the type to try and figure things out on my own...helps me learn something and save some money in the long run (i would hope)...Im only 21, so ive got a brain ready to soak in info, and a small wallet lol
all the more reason to get somebody who knows what they are doing. unfortunatly learning usally cost you more money.
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Re: Critique/help with this custom stroker combination
[Re: Quicktree]
#907396
01/17/11 09:24 PM
01/17/11 09:24 PM
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Joined: Apr 2009
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Quote:
Quote:
Quote:
you would be way ahead of the game to get with a builder and have them spec out your motor. save you a lot of trouble in the long run
your probably right about saving me the trouble, but ive always been the type to try and figure things out on my own...helps me learn something and save some money in the long run (i would hope)...Im only 21, so ive got a brain ready to soak in info, and a small wallet lol
all the more reason to get somebody who knows what they are doing. unfortunatly learning usally cost you more money.
well the way i see it, im half way there. Ive already chosen the crank, have a sure direction for the rods now, and just need to figure out pistons...Im still trying to decide if the extra 13 cubes over the 408 that id be gaining is even worth the extra cash..once im done pricing everything out ill make my decision. Is there anybody besides Performance Only who can set me up with something like this for a good price? (ive already pm'ed him)
Another question i have though is, am I really going to be pushing the limits of the stock block with this much stroke? I am only going with a 4.030" bore size, so im hoping ill be okay..I know the longer stroke might put more stress on the walls, but i cant see this combo making more than 515hp, 550tq at absolute most with the parts im selecting
Last edited by mshred; 01/17/11 09:25 PM.
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Re: Critique/help with this custom stroker combination
[Re: Quicktree]
#907398
01/17/11 09:48 PM
01/17/11 09:48 PM
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Quote:
the cubes will help more if you have the heads to match. if not it probably wont make much difference. as far as the blocks go it depends on what your goal is. factory sb are pretty strong imo. there are lots of good builders on here. Dan is doing the machine work on my stroker now.
who are some other builders on here that I can get in touch with for this? I know Brian at IMM is one, Competition Wedge another, but who else is there?
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Re: Critique/help with this custom stroker combination
[Re: Quicktree]
#907400
01/17/11 11:02 PM
01/17/11 11:02 PM
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Quote:
the list is endless, beat machine, Dwayne Porter(fast68plynouth),BG racing I could go n for a while good luck
LOL ill look into it then...you have a pm by the way!
anybody else done something similar to this and care to share any info/ words of wisdom. I checked out Andy's article, but there is no piston info really, and the motor isnt done anyways, so its kinda hard to get a rough hp per dollar figure without some dyno numbers
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