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#1
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Loose Timing Chain
How can you determine if you need a .005 or .010 short timing set?
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Tim Corcoran |
#2
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This is what it looks like with a STD chain
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Tim Corcoran |
#3
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That a brand new std chain?
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#4
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Yes
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Tim Corcoran |
#5
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Based on that picture I would order the .010 chain and see if you can install it.
Tom V
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#6
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Are the gears new, too ?
If they are new gears, I agree with Tom V that the .010 might fix it.
Good luck! |
#7
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Tim,
How much were the main saddles cut? Jeff
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Carburetor building & modification services Servicing the Pontiac community over 20 years |
#8
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I don't see that even .010" is going to help that much!
You may very well only beable to save that with a two gear drive set up .
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#9
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That’s a problem. This a new build ? If so I’m on the same thought as Shaker on the caps.
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#10
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Need Mike G
How did the ends of main bearing shells line up with the parting line?
Question is, did a linebore go high or is this a bogus chain and gear set? Clay |
#11
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Unknowingly at the time I let a butcher put this engine together, a pontiac guy butcher. Unfortunately this is not the only thing he ****ed up.
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Tim Corcoran |
#12
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Quote:
Who makes a two gear set-up? Two gear would make the engine a reverse camshaft rotation boat deal. $$$ with getting a cam grinder to do one of those for a Pontiac. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#13
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Sorry, 2 gear with the idlers.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#14
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I feel for you guy! In my case the cam to crank center line distance was shortened by .045" ! I had to throw away a fully prepped block ( $$$) because of botched line hones (3 times).
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#15
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Can a machinist fix the line hone or is the block trash. I'm not going to put a gear drive on a street car too noisey
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Tim Corcoran |
#16
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Maybe try another (brand) std timing set? Was it line honed, bored and honed, or neither? Another cut and run will only put it deeper in the block. |
#17
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Quote:
And they do make "quiet" gear drives. Don't know how quiet they are but can't be loud like the "noisy" version. They make them that way on purpose just for the noise. Clay |
#18
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Have someone measure the center to center measure from the crank to the cam. I would say a .010 under will be short enough.
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#19
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I bet a .010 chain will fix it. You'll be surprised how much tighter it's going to be.
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62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs |
#20
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Yeah but by the looks of my main bearings I may need work on the bores to fix it. I will know more after I get the machinist to look at everything. It may be the crank mains and the bores may be OK.
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Tim Corcoran |
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