Options for distributor drive gear for solid roller SB
#1576011
02/08/14 06:09 PM
02/08/14 06:09 PM
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Joined: Apr 2009
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Toronto
mshred
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I need to buy a new distributor drive gear for my motor since I am dropping in a crower solid roller. With my old billet hydraulic roller, I bought the MP shaft and gear combo, drove out the pin, and attached a comp bronze gear and the old pin. I know the Milodon also makes the complete shaft and gear setup for the small block http://www.summitracing.com/int/parts/mil-21535/overview/make/dodgeIs the bronze material superior to the others? Thi is going to be a street/strip deal that will see some miles, so I am slightly concerned about wear and longevity. I have no problem replacing the gear on a regular basis, but if I can start with a part that lasts longer, I would like to. I also heard a while back that crane was going to be offering some composite material for the chrysler drive gear that they already do for Ford and Chevy...IIRC it was much better for street use and longevity. Did that ever materialize? Anyone use it with success? Any other options I am forgetting?
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Re: Options for distributor drive gear for solid roller SB
[Re: Mopar Sam]
#1576013
02/09/14 10:49 AM
02/09/14 10:49 AM
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Joined: Jan 2003
Posts: 8,101
Tulsa OK
Bad340fish
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I got about 5000-6000 miles from my last bronze one. It wasn't trashed but was for sure worn. I am using the mopar gear and shaft.
68 Barracuda Formula S 340
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Re: Options for distributor drive gear for solid roller SB
[Re: Bad340fish]
#1576014
02/09/14 12:11 PM
02/09/14 12:11 PM
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Quote:
I got about 5000-6000 miles from my last bronze one. It wasn't trashed but was for sure worn. I am using the mopar gear and shaft.
did you notice bronze in your oil at all during oil changes?
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Re: Options for distributor drive gear for solid roller SB
[Re: Mopar Sam]
#1576015
02/09/14 12:11 PM
02/09/14 12:11 PM
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Quote:
Haven't used one myself, but crane # 69970-1 is a coated steel gear for roller cams. Fits small block and early hemi.
Thanks for the part number!
Would be interesting to hear if anybody has used this before.
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Re: Options for distributor drive gear for solid roller SB
[Re: pittsburghracer]
#1576018
02/09/14 12:31 PM
02/09/14 12:31 PM
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Joined: Jan 2003
Posts: 8,101
Tulsa OK
Bad340fish
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I agree with the high volume pump comment as well. I also try to run as thin of an oil as I can to help ease the strain on the gear. When I changed from 15W40 oil do 10W30 oil my idle went up 200RPM from the reduced load on the oil pump, all that extra load goes through that soft gear.
68 Barracuda Formula S 340
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Re: Options for distributor drive gear for solid roller SB
[Re: pittsburghracer]
#1576019
02/09/14 12:33 PM
02/09/14 12:33 PM
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mshred
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Quote:
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doing some reading...some say that the crane gear is not suitable for high volume oil pumps because of the extra force the gear will see
That's an easy fix. Take out the high volume pump. 
Well, I am reading one individual engine builder on another forum mention this as I have been doing some searching. Not sure how true it is though.
Also, I ran stock volume pumps with high pressure springs in them in all of my engines except for when I built the stroker. It was advised that I run the HV pump. I have thought about throwing a stocker back in with the high pressure spring, as I am not a huge fan of only 60psi hot going through the traps. However, not sure what I am losing/gaining going back to a non HV pump
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Re: Options for distributor drive gear for solid roller SB
[Re: Bad340fish]
#1576021
02/09/14 12:34 PM
02/09/14 12:34 PM
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Quote:
I agree with the high volume pump comment as well. I also try to run as thin of an oil as I can to help ease the strain on the gear. When I changed from 15W40 oil do 10W30 oil my idle went up 200RPM from the reduced load on the oil pump, all that extra load goes through that soft gear.
I assume you run the stock volume pump in yours as well?
When would the HV pump be necessary then? In my other engines the stock volume worked fine, but for the stroker the HV was recommended
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Re: Options for distributor drive gear for solid roller SB
[Re: Bad340fish]
#1576022
02/09/14 12:36 PM
02/09/14 12:36 PM
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Quote:
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I got about 5000-6000 miles from my last bronze one. It wasn't trashed but was for sure worn. I am using the mopar gear and shaft.
did you notice bronze in your oil at all during oil changes?
Nope, I imagine if you notice visible pieces of brass at oil changes its not going to last anywhere near as long as 5000 miles.
Also, if crain doesn't recommend their gear for the high volume pump that goes ahead and rules it out altogether for me. I don't run a high volume pump but it makes the part sound less durable to me.
I have to call crane and ask- this is a builder who is saying this about the crane gear on another board.
I didn't notice any brass in my oil as well when I did my oil changes couple of years ago with the other cam, but if I can avoid using a wear item I would like to.
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Re: Options for distributor drive gear for solid roller SB
[Re: mshred]
#1576025
02/09/14 04:02 PM
02/09/14 04:02 PM
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Joined: Oct 2006
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Sweden
Mopar Guy
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Why is so many so focust around what oil presiure there pump is produsing ? IMO the hi presiure will not save any thing quite oposit harm components ! Bearing clearence and good oil and a std oil pump will do al you wish whit out having to put in harder springs to jiuce up the presiure  I run my RB 505 stroker whit a stock melling oil pump whit a roller cam and bronze drive gear whit 10w40 mineral oil that contain zink and the presiure at idel is around 30 psi (hot engine) and the pump valve breaks at around 55 psi and i rev that engine to 5500rpm and no issues at al  remember that it is the oil film that have to cary the load not the presiure 
Last edited by Mopar Guy; 02/09/14 04:04 PM.
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Re: Options for distributor drive gear for solid roller SB
[Re: Mopar Guy]
#1576026
02/09/14 04:34 PM
02/09/14 04:34 PM
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Quote:
Why is so many so focust around what oil presiure there pump is produsing ? IMO the hi presiure will not save any thing quite oposit harm components ! Bearing clearence and good oil and a std oil pump will do al you wish whit out having to put in harder springs to jiuce up the presiure I run my RB 505 stroker whit a stock melling oil pump whit a roller cam and bronze drive gear whit 10w40 mineral oil that contain zink and the presiure at idel is around 30 psi (hot engine) and the pump valve breaks at around 55 psi and i rev that engine to 5500rpm and no issues at al remember that it is the oil film that have to cary the load not the presiure
I shift at over 7k with my small block...a little different then 5500rpm.
All 3 of my motors that had a stock volume pump and a high pressure spring came apart at the end of the season. These were motors that were beat on on the street and track...bearings looked MINT. I don't think the high pressure was hurting anything tbh.
Now lets get back to the discussion about the drive gears....anybody else have any experience with the bronze stuff or the coated gears they would like to share?
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