PY Online Forums - Bringing the Pontiac Hobby Together
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PY Online Forums - Bringing the Pontiac Hobby Together (https://forums.maxperformanceinc.com/forums/index.php)
-   Pontiac - Race (https://forums.maxperformanceinc.com/forums/forumdisplay.php?f=419)
-   -   Distributor gear. (https://forums.maxperformanceinc.com/forums/showthread.php?t=792611)

gman005 07-09-2016 05:05 PM
Distributor gear.
 
What would cause a gear to wear off half the teeth? It's a roller cam and it had a composite gear.

PAUL K 07-09-2016 05:56 PM
Which half wore off? :D

tom s 07-09-2016 07:22 PM
What oil pump,80lb pumps are gear killers.Tom

rompn63 07-09-2016 08:50 PM
A new cam can do that.

Jeff Kinsler 07-10-2016 08:42 AM
How old is the gear? Had it happen to mine last year

poncho-mike 07-10-2016 09:43 AM
I don't race, but I built several high performance engines for street cars over the years. H-O Specialties used to sell a set of galley plugs, and the one inside the block had a hole drilled into it to lubricate the distributor get.

I never was sure if that was needed or not for a street car. Does anyone still do that?

i82much 07-10-2016 09:46 AM
Quote:
Originally Posted by poncho-mike (Post 5600437)
I don't race, but I built several high performance engines for street cars over the years. H-O Specialties used to sell a set of galley plugs, and the one inside the block had a hole drilled into it to lubricate the distributor get.

I never was sure if that was needed or not for a street car. Does anyone still do that?
Yes, this was something I specifically requested my shop to do when building my engine.

gman005 07-10-2016 10:28 AM
The gear had some dyno pulls and about 10 runs on it. I have the oil hole at the gear. It's a 80lb pump from Butler.

slowbird 07-10-2016 10:32 AM
Get rid of the 80lb pump, use galley plug with small hole to oil gear (.040-.060), make sure there are no burrs/shape edges on cam gear and going racing.

firechickenman 07-10-2016 01:36 PM
New cam? Did you check the gear on it for any sharp edges?

Bill Eveland 07-10-2016 04:30 PM
Did you break in the new cam with a bronze gear? It will soften the edges than put the composite gear back on.

gman005 07-11-2016 11:45 AM
Yes it was a new cam. No I didn't break in the cam with a bronze gear. What's wrong with the oil pump?

TedRamAirII 07-11-2016 12:09 PM
It takes a lot of power (stress) to turn a 80 psi pump. Maybe the gear isn't up to the task. Hook up a drill to the pump, spin it and you will see how much power it takes.

charlie66 07-11-2016 01:19 PM
I have had a BOP gear for 7 years with a 80 psi pump with no problems...

Old Goat Racer 07-11-2016 03:48 PM
Why did u pull the dizzy?

twooldgoats 07-11-2016 03:50 PM
I had a composite gear fail once, but only after several years' service in one engine and then being moved to a new block and camshaft. We think it was the move that did it. It showed no sign of wear when we reused it, but definite signs of wear after the failure. I would suspect burrs on the the cam before suspecting the difficulty of turning an oil pump. Incidentally, we didn't use a bronze gear for break-in either time, though it certainly wouldn't hurt.

Jim

tom s 07-11-2016 03:54 PM
Charlie,go by a lottery ticket!

gman005 07-11-2016 03:59 PM
We pulled it out because the motor died.

Ken MacNicol 07-11-2016 04:11 PM
Mine has well over 1000 runs, in two different short blocks, and 80 lb pump

firechickenman 07-11-2016 04:46 PM
BOP gear and 80 psi pump in mine too. Only about 1500 miles and about 100 passes and all is well.....so far.


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