anyone running a 331 or a 347 stroker in there fox? Reply #15 – September 17, 2008, 10:42:04 AM maybe you didnt see the vids i posted, but the motor ran, and the car was about 90% complete. it just needed several odds and ends finished to be able to drive it. Quote Selected
anyone running a 331 or a 347 stroker in there fox? Reply #16 – September 17, 2008, 09:37:22 PM --------------------------------------------------------------------------------"Not true due to the extra angle of the rod travel, but they will go when they go nothing is a guarantee I have had turbo and SC (15-20 lbs boost) friends use 331 due to the less resistance then a 347."Go to SBFTECH.com and review the "Myths and Rumors" section. The 331/347 debate is clarified. There is no reason to not to build a 347. Lots of mis-information out there in mag rags and on the net. That site sets it straight. Quote Selected
anyone running a 331 or a 347 stroker in there fox? Reply #17 – September 17, 2008, 10:03:04 PM The Myth and Rumor that is NOT a RUMOR. It take money tomake POWER. Just like they said don't be cheap on your parts oryou wil get to buy parts twice. Just my 2 cents Quote Selected
anyone running a 331 or a 347 stroker in there fox? Reply #18 – September 18, 2008, 12:42:15 AM Quote from: thunderjet302;235969347 will live just as long as a 331 if you build it right Quote from: 86T-bird;236549--------------------------------------------------------------------------------"Not true due to the extra angle of the rod travel, but they will go when they go nothing is a guarantee I have had turbo and SC (15-20 lbs boost) friends use 331 due to the less resistance then a 347."Go to SBFTECH.com and review the "Myths and Rumors" section. The 331/347 debate is clarified. There is no reason to not to build a 347. Lots of mis-information out there in mag rags and on the net. That site sets it straight.Yeah that's where I get my SBF info and how I know a 347 will live just as long as a 331. Why not build the 347 and get the extra cubes..... Quote Selected
anyone running a 331 or a 347 stroker in there fox? Reply #19 – September 18, 2008, 01:02:56 AM what is the 347 now a days? its not actually 347 for corrected pistons but close ,, right?The rod angle on the 347 "could" decrease the life of your cylinder walls in the middle but I dont own one, never mic'd one out after wear, just kept up on the topic a little now and again.Anyone ever compared the specs on a chevy 302 to the ford 302? Now those were some RPM gettin sob's. Quote Selected
anyone running a 331 or a 347 stroker in there fox? Reply #20 – September 18, 2008, 07:23:31 AM QuoteThe only advantage of the 331 is longevity because of the shorter strokeQuote347 will live just as long as a 331 if you build it rightQuoteNot true due to the extra angle of the rod travel***SIGH***Rod angle is proportional to rod/stroke ratio.As far as rod/stroke ratio with a 5.4 rod: 347 = 5.4 / 3.4 = 1.588:1 For the 5.315 rod:331 = 5.315/3.25 = 1.635:1347 = 5.315/3.4 = 1.563:1Many motors come from the factory today with worse rod/stroke ratios. The inline 6-250 has a 1.50 rod/stroke ratio for one.And as far as DETERMINING HOW MUCH CYLINDER WALL PRESSURE IS APPLIED, read here: http://www.physicsforums.com/showthread.php?t=127842The results? The 331 generates 96% of the sidewall pressure that a 347 does.The formula is here as well.... http://www.hcs.harvard.edu/~jus/0303/kuo.pdfWhat about the compression height of the shorter piston on the long rod 347 you say?A 5.315 rod 347 uses the same piston as a 331 with a 1.175" compression height with a 1.59 rod ratio as opposed to the 1.09" compression height used in 5.4" rod equipped 347's with a 1.56 rod ratio. The larger piston is of course going to be heavier, but the wrist pin is moved down and does not intersect the oil ring land which is a bonus as well (although the newer 5.4 kits do not have the oil consumption issues the old ones did). Like everything else it's a trade off, but the shorter life........mmmm not buying it. Not if properly built and assembled. By the rod ratio logic, all of us 5.0 guys should destroke to 289 cubes.....Food for thought: An old 400 SBC. 5.565 rod and a 3.75 stroke FROM THE FACTORY with CAST pistons. R:S = 1.496 Quote Selected
Topic: anyone running a 331 or a 347 stroker in there fox? (Read 2547 times)
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Topic: anyone running a 331 or a 347 stroker in there fox? (Read 2547 times)
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