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Horsepower limits of a Service Block? |
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jpnjim
AMC Addicted Joined: Nov/25/2007 Location: New England Status: Offline Points: 2752 |
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great reply, thanks! Makes me wonder how many of the 401's with failed walls were bored +.045, +.060, or more (?). I also wonder how much strength a std, or .010-.020 over 401 gives up compared to a Service block with 4.125 or less of a bore(?) It's a shame that some of the others sawed themselves in half before they could tell what went wrong, but if it was like a 302 Ford splitting in half, or a Buick 455 spitting out the mains I think it would be obvious. Thanks for the info, The strength of running a Service Block seems to be worth the cubes given up, and the slightly less flow/more valve shrouding of the smaller bore.
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71 P-code 4spd Javelin/AMX
some Jeeps and some Fords |
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Lyle
AMC Addicted Joined: Jul/17/2014 Location: None Status: Offline Points: 772 |
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I believe I read Pentske sleeved some race engines right from the start.
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one bad rambler
AMC Addicted Joined: Jan/09/2008 Location: On The Island Status: Offline Points: 2007 |
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I find it hard to believe that 800HP is the limit...Harmonic`s can be an issue...i never realized how much a crank flexes untill it was showed to me on a dyno with a strobe light...Several years back we were sent 3 engines to be dyno`d ...At the customers request we were asked to push all 3 to failure (Through Boost) then they could be gone trough for future improvements ...This was done on a chassis dyno...his goal was a reliable 1,200hp to the wheels out of a 3.5l Mitsubishi V6...The money spent was mind blowing
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68 AMX 390 4 Speed,68 American,64 American 2 Door Wagon Altered Wheelbase,78 Concord Build 360,727,8.8
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Hurst390
AMC Addicted Joined: Apr/20/2008 Location: secret Status: Offline Points: 5822 |
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I don't agree with that. I would bet the farm your walking the cap with 2 bolt mains at 8-900 hp. Pull it down and you will see how shiny the mating surface is on the caps and block. |
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SC/Hurst Rambler
11.62 120 100% Street Legal |
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Lyle
AMC Addicted Joined: Jul/17/2014 Location: None Status: Offline Points: 772 |
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An article on crankshafts:
http://www.hotrod.com/articles/crankshafts-how-to/ Notice picture #3 in the article and the material of the "stronger" crankshaft that has been removed. Big "IF" someone spent the money or could order a billet crankshaft with much less mass then the current crankshafts available then I believe 1000 + HP could reliably be made. All the other pieces are there - just the missing link, my opinion.
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jpnjim
AMC Addicted Joined: Nov/25/2007 Location: New England Status: Offline Points: 2752 |
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thanks Lyle, do you mean this picture? |
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71 P-code 4spd Javelin/AMX
some Jeeps and some Fords |
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jpnjim
AMC Addicted Joined: Nov/25/2007 Location: New England Status: Offline Points: 2752 |
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Interesting, did you go to 4 bolt caps at that point and did the caps stop walking?
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71 P-code 4spd Javelin/AMX
some Jeeps and some Fords |
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Hurst390
AMC Addicted Joined: Apr/20/2008 Location: secret Status: Offline Points: 5822 |
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If you want to be safe? I wouldn't recommend 2 bolt mains at anything over high 600's
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SC/Hurst Rambler
11.62 120 100% Street Legal |
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Hurst390
AMC Addicted Joined: Apr/20/2008 Location: secret Status: Offline Points: 5822 |
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My experience has shown me that 2 bolt caps showed signs of cap walk @ 700hp..
That was an iron headed 420 that ran 145.11 mph 1/4 mile @ 2950# My advice would be to make the investment in 4 bolt caps... The guys running 900 hp 2 bolt mains..what do they run and how long have they been together? |
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SC/Hurst Rambler
11.62 120 100% Street Legal |
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purple72Gremlin
AMC Addicted Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16614 |
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