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  #46 (permalink)  
Old 04-13-2013, 05:10 PM
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when i did the dummy up i founded that the billet timing set from comp cams part number 7136 was really tight fitting , had to use a bolt to pull on to cam shaft noise , then when i striped the block back down this is what i found. the cam bearing still looks to be ok and smooth to touch. now will the chain free up like with its frist run or should i just replace it with a new one.

i think i will go go and get a set for peace of mind.

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  #47 (permalink)  
Old 04-14-2013, 05:22 AM
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It took more time to show use that picture , than tap in a new cam bearing.

I have used/reused some ugly cam bearings. If you are already disassembled , then I agree.
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  #48 (permalink)  
Old 04-14-2013, 07:14 AM
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Holy crow!!!. Will someone above give this poor guy a break??. What next to go wrong??.GEZZZ!!!.
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Old 04-14-2013, 02:27 PM
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Holy crow!!!. Will someone above give this poor guy a break??. What next to go wrong??.GEZZZ!!!.
thanks grary , it's not to bad. better to know these thing now before it togiver and it frist start up.
have decided to get new main bearing ms909hx which will give me more cleancers for peace of mind and will be getting a new timing gear set as the one i have is just to tight which puts to much load on the frist cam bearing. go's to show how important a dummy up is before final assamble.
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  #50 (permalink)  
Old 04-14-2013, 02:54 PM
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That super tight chain would likely be perfect about 10 minutes after start up.
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  #51 (permalink)  
Old 04-14-2013, 03:04 PM
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That super tight chain would likely be perfect about 10 minutes after start up.
hi vinniekq2 , this timing gear set is Pre-stretched , so i'm not sure if will free up after it's frist run. what do you think or other that may had used one.
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  #52 (permalink)  
Old 04-14-2013, 04:26 PM
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I guess if it is truly too tight,dont use it.They do stretch a little and a little is all you need
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  #53 (permalink)  
Old 06-03-2013, 06:17 AM
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Sorry, late to this thread... Hope your build is still going.

But I was wondering maybe a set of direct drive gears would be better than a chain?
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  #54 (permalink)  
Old 06-03-2013, 06:45 AM
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belt driven is common on race engines
then chain
gears? rare now
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  #55 (permalink)  
Old 06-03-2013, 07:00 AM
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Originally Posted by UltimateRoadWarrior View Post
Sorry, late to this thread... Hope your build is still going.

But I was wondering maybe a set of direct drive gears would be better than a chain?
gears work very well- PROVIDED YOU USE A SET WITH AN ADJUSTABLE SINGLE IDLER GEAR

If you plan on using one of the cheaper sets with floating dual idler gears you'd be better off with a much cheaper double chain system.
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Old 06-03-2013, 01:59 PM
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gears work very well- PROVIDED YOU USE A SET WITH AN ADJUSTABLE SINGLE IDLER GEAR...
I've seen idler gear sets where one can adjust the offsets for the cam and crank sprockets, but none where 1 of the idler gears were adjustable. But I'll bet you've seen alot more than me.
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  #57 (permalink)  
Old 06-03-2013, 09:18 PM
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Short of "some" race applications where cam adjustments are a constant,the gear drives are unnecessary.The gear drives are also very hard on cam bearings and the front of cams.That is more so true on cast cams over billet(sp)cams.
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  #58 (permalink)  
Old 06-04-2013, 06:55 AM
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Originally Posted by UltimateRoadWarrior View Post
I've seen idler gear sets where one can adjust the offsets for the cam and crank sprockets, but none where 1 of the idler gears were adjustable. But I'll bet you've seen alot more than me.
Shaver-Wesmar Small Block Chevy Gear Drive, Standard Cam Height - Speedway Motors, America's Oldest Speed Shop

Milodon, Single Idler Gear Drive, Ford FE 390-428 - Competition Products

there are two examples of an adjustable single idler gear cam drive setup, I'm sure there are more.
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  #59 (permalink)  
Old 06-04-2013, 08:36 AM
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Ah very cool, I've not seen those before. What do you think of the statement 1Gary made of the front cam bearing wear. Also, like Vinnie said, maybe a belt is better? I know some people favor belts because they dampen the harmonics of the crank vibrations sent to the cam. But on the negative side I'm sure they have some kind of stretch factor in high RPMs.
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  #60 (permalink)  
Old 06-04-2013, 08:48 AM
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Originally Posted by bjautos7 View Post
when i did the dummy up i founded that the billet timing set from comp cams part number 7136 was really tight fitting , had to use a bolt to pull on to cam shaft noise , then when i striped the block back down this is what i found. the cam bearing still looks to be ok and smooth to touch. now will the chain free up like with its frist run or should i just replace it with a new one.

Its a good idea to use a performance cam bearing as stock replacement ones are to soft.
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