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Dyno Troubles - bellhousing |
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KLW
AMC Nut Joined: Sep/02/2012 Location: MN Status: Offline Points: 488 |
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Posted: Sep/24/2014 at 3:51pm |
Hi,
I went to the dyno today with my fresh 417 stroker in tow. The first problem we ran into was not having a neutral balanced flywheel. The problem was solved by using a neutral balanced flywheel from a PONTIAC....yes pontiac bolted right on! The next problem was a show stopper. I need a bellhousing. I was told ahead of time the std V8 bell is too tall so I picked up one for a three speed part # 3212425. That wouldn't work because the center is too small and the tranny bolts are too close together. I was told by the dyno guy that in the past when he had done AMC motors, the owner brought a bellhousing that had a GM tranny pattern on it. Does such a thing exist? If so, what part number(s) sould I look for? I am willing to buy, rent,lease borrow,etc one if anyone has one just so I can get this thing dyno'd. PLEASE, any help here would be appreciated! Kurt |
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1981 Spirit
(420 cu in stroker - 570 hp) 1966 Ford Fairlane Convertible (331 Cu In - 450 HP) |
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scott
AMC Addicted Joined: Jul/10/2007 Location: Wildwood Pa. Status: Offline Points: 3502 |
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There are scatter shields out there with a chevy bolt pattern. I'm not sure on the depth.
There are 6 1/2" deep AMC Jeep bellhousings, the center hole is about 4 3/4", bolt holes are about 7 1/2" apart. These bells may have a Ford transmission bolt pattern, or a Ford T5 pattern, among others. Does the dyno operator want a scattershield??? |
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KLW
AMC Nut Joined: Sep/02/2012 Location: MN Status: Offline Points: 488 |
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Yes, a scatter shield would be fine as long as the depth is OK. Do you have an old one you would like to sell/rent/?
If not. do u have an idea what year/application these Jeep bells would be so I would know what to look for? Kurt |
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1981 Spirit
(420 cu in stroker - 570 hp) 1966 Ford Fairlane Convertible (331 Cu In - 450 HP) |
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purple72Gremlin
AMC Addicted Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16614 |
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Pontiac flywheel actually fit????
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KLW
AMC Nut Joined: Sep/02/2012 Location: MN Status: Offline Points: 488 |
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YES, we couldn't believe it either. But, a pontiac flywheel from a 455(I beleive) lined up perfectly. We checked it with a dial indicator and it showed .010 out of round but we don't know if that is true (or thereabouts) with a true AMC flywheel.
At any rate, we thought it would be good for dyno testing but not sue about long term use as the starter would need to be shimmed.... |
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1981 Spirit
(420 cu in stroker - 570 hp) 1966 Ford Fairlane Convertible (331 Cu In - 450 HP) |
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scott
AMC Addicted Joined: Jul/10/2007 Location: Wildwood Pa. Status: Offline Points: 3502 |
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I would think the dyno operator would want a scatter shield, in case the flywheel came apart for some reason.
The regular AMC Jeep bellhousings were used from the late 70's to the early 80's behind 6 & 8 engines. The key is the 6 1/2" depth. |
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Judo390
Supporter of TheAMCForum Joined: Apr/29/2012 Location: Newton, IA Status: Offline Points: 474 |
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I have a Lakewood scattershield, old deep style I think, sitting in storage that I would loan you if that helps. Bad news is I am in central Iowa, not sure where in MN you are at.
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tufcj
Supporter of TheAMCForum Supporter of TheAMCForum Joined: Jul/10/2007 Location: Watkins, CO Status: Offline Points: 4097 |
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The bolt pattern on the Pontiac is the same but I believe when you bolt up the bell, the gear is going to be too close to the block for the starter to work correctly. Bob tufcj |
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69 AMX
74 Javelin AMX 67 Rogue If you need a tool and don't buy it... you'll eventually pay for it... and not have it. Henry Ford |
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KLW
AMC Nut Joined: Sep/02/2012 Location: MN Status: Offline Points: 488 |
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An old, long style won't work. From what it sounds like, the 6 1/2" deep one would be the one I need. Thanks anyway!
As for the Pontiac FW, we did notice the ring gear depth and were prepaed to shim the stater. This would have been a temp fix just for the dyno session. |
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1981 Spirit
(420 cu in stroker - 570 hp) 1966 Ford Fairlane Convertible (331 Cu In - 450 HP) |
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Photon440
AMC Nut Joined: Sep/22/2014 Location: B.C. Canada Status: Offline Points: 327 |
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I had a Pontiac 455 HO at one time...the factory red-line was 5200 rpm. Hope your flywheel is safe after that. :)
Just because it bolts right up doesn't mean the Pontiac and AMC balance will be the same though. |
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