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#1
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Distributor gear
I have a Comp roller cam in my engine and a Davis distributor I'd like to install. What distributor gear are people using with a roller cam? Thanks
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#2
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Seems like a lot of guys like the composite BOP Engineering gear. I have one ready to install. I think that or a bronze gear are the only options out there
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67 LeMans, 326, M20, 3.31 12 Bolt |
#3
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Both Butler and my engine builder said to use the BOP poly gear with my CC roller cam and DUI HEI..
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70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Ray Klemm calibrated Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear https://youtube.com/shorts/gG15nb4FWeo?feature=share |
#4
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BOP poly gear here. So far so good.
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Ken '68 GTO - Ram Air II 464 - 236/242 roller - 9.5” TSP converter - Moser 3.55 Truetrac (build thread | walk around) '95 Comp T/A #6 M6 - bone stock (pics) |
#5
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This is my go-to:
https://www.holley.com/products/igni...rs/parts/85631 If you want, after @1000 miles, you can switch to the BOP, it's less than half the price of the BOP, and the first gear is usually somewhat sacrificial. If you don't switch, or regardless of which gear you use, check it after @1000 miles. .
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. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
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#6
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You need to know the dizzy shaft diameter too. (.491/.500)
.
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. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
#7
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Hei should be 491 msd is 500 make sure you dress the cam gear and you should have no problems with either brass or composite
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1969 carousel red firebird 455, richmond 5 speed 1964 540 gto 1971 lemans sport convertible 1972 Maverick under slow construction |
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#8
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I've dressed the last few I did, it helps, but there always seems to be some 'mating' wear.
I use a honing stone. Best advice, check it to be sure. .
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. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
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#9
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Articles from MSD will point out the effort that goes into a ring-and-pinion installation. Yet many don't think twice about the distributor gear/cam gear relationship unless performance starts to suffer. How the dist gear and cam gear mesh is just as important as the quality of the metals involved. MSD states the excessive clearance between the gear teeth shouldn't be fixed by shoving the distributor farther into the hole; this screws up the proper wear pattern.
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
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#10
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Quote:
.500 and .491 gears are 150 $ I ran a BOP gear for over a decade, did not dress a thing ( but cam was used) and it looks new. I reused it for the last engine. The Comp Cams core had a gear that looked very smooth. Almost polished. So I ran it as is. Tom s has had great luck with running a stock iron gear for 5 minutes then switching to BOP/bronze |
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#11
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Running the stock gear is something I learned form Joe Sherman(RIP).We just ran it for breakin on the Dyno or run stand.We always ran the drilled dist gallery plug.Tom
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#12
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BOP poly gear, no issues, about 20k miles on it.
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-Jason 1969 Pontiac Firebird |
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#13
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As a note, a quick way to check (generally) gear clearance is to grab the rotor and rock it back & forth.
Another way to check is with a timing light, blip the throttle, and see how much timing goes past initial on decell (RPM). Most don't realize there's a problem until they actually pull the dizzy and check. Running a standard gear for a short period of time is a great idea, it works, and have done that before. Even after dressing the cam gear. .
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. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
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#14
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68 Firebird. IA2 block, 505 cu in, E-head, Solid roller 3650 weight. Reid TH400 4:11 gear. 29" slick. Best so far 10.12@133 mph. 1.43 60 ft. 76 Trans am, TKX .81 o/d, 3.73 Moser rearend, 468 with KRE D-ports, Doug headers, 3" Exh. |
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#15
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Quote:
So I gave BOP Engineering a call(answered right away, which is HUGE these days), I told him I was gonna be running a Luhn Performance oil pump; he said no problem. He said quite a few guys are running the BOP composite gears with flat tappet cams just for the extra durability. He also said that high pressure pumps are much harder on everything than hi flow
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67 LeMans, 326, M20, 3.31 12 Bolt |
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#16
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I have the BOP gear on my solid roller engine been in there for years never dressed the cam gear it still looks like new. I also have one on my hyd roller car no cam dressing put it in and forget it. This has been my experience.
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Tim Corcoran |
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