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#1
07-09-2016, 05:05 PM
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Distributor gear.
What would cause a gear to wear off half the teeth? It's a roller cam and it had a composite gear.
__________________
 A new best of 9.135 @ 145.4171 Lemans Sport. 72 Lemans Sport. RIP 75 Grandville Convertible. |
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#2
07-09-2016, 05:56 PM
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Which half wore off?
Last edited by PAUL K; 07-09-2016 at 06:48 PM. |
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#3
07-09-2016, 07:22 PM
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What oil pump,80lb pumps are gear killers.Tom
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#4
07-09-2016, 08:50 PM
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A new cam can do that.
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#5
07-10-2016, 08:42 AM
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How old is the gear? Had it happen to mine last year
__________________
540 c.i. Ultra Street Combo Tiger Heads with Tiger Intake Induction Solutions fogger with .046s 1.079 4.52 155.15 3000 lbs 7.77 @ 169 1/4 Mile (2015) with EHTTFMF!! 7.17 @ 188 1/4 mile (2024) Special Thanks to: Ron at Rhodes Custom Auto Butler Peformance Jim Hostler's Transmissions (HOSGTO) on here Induction Solutions BES Racing Engines. Cheeseburger VP Racing Fuels Calvert Racing |
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#6
07-10-2016, 09:43 AM
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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? |
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#7
07-10-2016, 09:46 AM
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Quote:
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#8
07-10-2016, 10:28 AM
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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.
__________________
A new best of 9.135 @ 145.4171 Lemans Sport. 72 Lemans Sport. RIP 75 Grandville Convertible. |
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#9
07-10-2016, 10:32 AM
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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.
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#10
07-10-2016, 01:36 PM
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New cam? Did you check the gear on it for any sharp edges?
__________________
Greg Weigart IAIIA 520/pump gas/SD 325 E-heads/266-272 SR cam/1050 Dominator/3.73/ET Street Radial Pro/3300lbs/1.35 60'/[email protected]/[email protected] Hot Rod Drag Week finishing averages: 2014 - 11.12 @ 118.56 2015 - 10.84 @ 124.97 2016 - 10.56 @ 127.88 2017 - 10.29 @ 130.74 2018 - 10.29 @ 130.53 2019 - 10.16 @ 132.34 2021 - 10.09 @ 132.69 - Quickest Pontiac 2022 - 10.13 @ 133.07 2025 - [email protected] - 2nd place SRBBNA 
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#11
07-10-2016, 04:30 PM
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Did you break in the new cam with a bronze gear? It will soften the edges than put the composite gear back on.
__________________
Illinois Outlaw Gassers 6.27@107 9.97@131 |
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#12
07-11-2016, 11:45 AM
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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?
__________________
A new best of 9.135 @ 145.4171 Lemans Sport. 72 Lemans Sport. RIP 75 Grandville Convertible. |
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#13
07-11-2016, 12:09 PM
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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.
__________________
1968 Firebird 400 RAII M21, 3.31 12 bolt, Mayfair Maize. 1977 Trans Am W72 400, TH350, 3.23 T Top Everyone you will ever meet knows something you don't. Bill Nye. |
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#14
07-11-2016, 01:19 PM
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I have had a BOP gear for 7 years with a 80 psi pump with no problems...
__________________
My Half AN Injun..... |
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#15
07-11-2016, 03:48 PM
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Why did u pull the dizzy?
__________________
 3 Generations of "Beach Boys Racing" ! Everybody knows somthin. Nobody knows everything ! 1st time on a dragstrip, 1964. Flagstart ! "Thanks for the entertainment." "Real Indians Don't Wear Bowties" |
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#16
07-11-2016, 03:50 PM
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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
__________________
****'63 Tempest, 475" IAII, Wenzler Super Chief heads, converted to blown alcohol, Birdcatcher, Littlefield 10-71 high helix. Best pass to date: 7.67 @ 181.59 (1/4 mi.), 4.95 @ 143.67 (1/8 mi.), 1.18 (60 ft) 7.75 @ 178 pass: https://www.youtube.com/watch?v=Iez3...ature=youtu.be First seven second pass(7.98): https://wwwoutube.com/watch?v=DK17...ature=youtu.be Thanks to Paul Carter @ Koerner Racing Engines 
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#17
07-11-2016, 03:54 PM
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Charlie,go by a lottery ticket!
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#18
07-11-2016, 03:59 PM
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We pulled it out because the motor died.
__________________
A new best of 9.135 @ 145.4171 Lemans Sport. 72 Lemans Sport. RIP 75 Grandville Convertible. |
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#19
07-11-2016, 04:11 PM
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Mine has well over 1000 runs, in two different short blocks, and 80 lb pump
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#20
07-11-2016, 04:46 PM
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BOP gear and 80 psi pump in mine too. Only about 1500 miles and about 100 passes and all is well.....so far.
__________________
Greg Weigart IAIIA 520/pump gas/SD 325 E-heads/266-272 SR cam/1050 Dominator/3.73/ET Street Radial Pro/3300lbs/1.35 60'/[email protected]/[email protected] Hot Rod Drag Week finishing averages: 2014 - 11.12 @ 118.56 2015 - 10.84 @ 124.97 2016 - 10.56 @ 127.88 2017 - 10.29 @ 130.74 2018 - 10.29 @ 130.53 2019 - 10.16 @ 132.34 2021 - 10.09 @ 132.69 - Quickest Pontiac 2022 - 10.13 @ 133.07 2025 - [email protected] - 2nd place SRBBNA
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