What's you're opinion... stroke vs. bore

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02-26-2015 | 05:18 PM

#51

CDShack

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From: Red Oak, Texas

Quote:

Originally Posted by dereknkathy

Stroke is cheaper to add later than bore. Crank and pistons instead of block and pistons. Way back in the old days they didnt neasure displacement. They measured bore area. Felt it made little to no diff how far the piston went up and down.

OP, probably ought to decide on one or both now, but not one now, one later. Stroke is crank, longer rods, pistons with shorter wristpin height, likely clearencing the block somewhere, an likely a stroker pan. (don't ask!!!) Bore is nice forged pistons, new block or bore work (and everything else you oughta do while it's open, like cam bearings, decking, etc. etc.) If you don't design it all it once, you end up buying good expensive pieces twice.
SO MUCH CHEAPER in the longrun to bite the bullet and do it all as once.

My machinist has a sign in his shop entry: "SPEED COSTS MONEY..........how fast do you wanna go???"

02-26-2015 | 05:58 PM

#52

Full Force

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From: Olmsted Falls,Ohio Marblehead,Oh

Quote:

Originally Posted by CDShack

SO MUCH CHEAPER in the longrun to bite the bullet and do it all as once.

My machinist has a sign in his shop entry: "SPEED COSTS MONEY..........how fast do you wanna go???"

That is the truth!!!

03-01-2015 | 01:32 AM

#53

I'CE

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a bit off the OP's plans, but just for kicks ck. out the bore and stroke combination, note the rod legth too OSO ad#60249 .. like Mild said they need to be properly set up.

Last edited by I'CE; 03-01-2015 at 01:44 AM.

03-01-2015 | 10:13 AM

#54

offshorexcursion

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From: Traverse City MI

http://www.offshoreonly.com/classifi...o60249-en.html

Thanks for sharing I'CE. It is interesting all the combos out there. Unfortunately no one has un biased proof on what works best, safestest, most power.

I don't like that combo personally..... Looks like they lowered the compression on a NA supercat combo with a blower stuck on top...

Ilmor did just merge with scorpian race engines...

03-01-2015 | 10:26 AM

#55

MILD THUNDER

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From: chicago

Quote:

Originally Posted by BajaIceBreaker

I like all the insight. Very entertaining. I think there's a few takeaways from this...

1) Go with the larger bore AND the larger stroke. --> "The no-brainer"
2) Bolt on a blower for more power --> Not really part of the qusstion, and completely complicates the question, but 100% agreed
3) The consensus seems to agree, all things other things considered equal --> No measurable difference

With that in mind... let's throw in a few more variables...
--Now i'm starting to get real to life--
1) Let's consider it's a retrofit hyd roller cam at about 589, 610 lift
2) Aluminum Dart Pro 1 at 310 cc
3) 800 cfm Holly vacuum secondary
4) No room for a blower (blowers are out of the question)
5) OK exhaust (aluminum manifolds with individual runners for only 12 inches)
6) Purpose is to go 60 MPH and drink heavily when I get there in a 13,000# Baja
7) The 4.25 stroke engine is around $3500 the 4.00 stroke engine is around $4000 new (same warranty)

Oh... one more variable.... I'm not going to build them bigger in the future.

GO!!!!

What engines do you have now, and how fast are you going??

03-02-2015 | 07:54 PM

#56

BajaIceBreaker

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From: Cleveland, OH

i have 454's and I'm running around 62 mph on a good day.That was before i lost a motor. Not that I really want to go much faster, its a tank. But if i had the same speed and really good reliability, I could be happy. Looking for a good smooth idle, easy starting, and reliability... and hopefully 65 MPH.