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Rod & Main bearing clearance?
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Canted Valve
DRR S/Pro
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For what it's worth, David Reher recommends 10W30 for bracket engines. Or at least he has in the past.


Illegitimi non carborundum
 
Posts: 2386 | Location: OKC, OK | Registered: February 15, 2008Reply With QuoteReport This Post
Goob
DRR Pro
Picture of Goob
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quote:
Originally posted by Canted Valve:
For what it's worth, David Reher recommends 10W30 for bracket engines. Or at least he has in the past.


I've run 10w30 "Dino" Valvoline in every race engine I've had, sometimes break them in on 5w30.
I add some Lucas Zinc additive for my flat tappet cam.


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Dave Cook
N375
 
Posts: 1883 | Location: Indy | Registered: November 21, 2008Reply With QuoteReport This Post
seabass
DRR S/Pro
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quote:
Originally posted by Holytown:
quote:
Originally posted by seabass:
quote:
Originally posted by "The Bender":
In my TD engine I ran . 003-.0035 rods and . 0035-.004 in the mains with straight 50W, never had issues. 100# oil pressure at the stripe at 82-8400. I did have a pan heater and used it religiously.

Now that I've built two late model Hemis for my bracket car I went with . 0025 on the rods and . 003 on the mains, with 15W-40 oil, 70#@6400 at the stripe, again no issues.....

For me the old .001 per inch of journal diameter works well with steel rods/cast iron block. With aluminum rods/block I always added .0005-.001 more clearance.


Me 2, now I run 40w at times as well, bearings are always perfect


Straight 40w? Why not 10-40? Does it have to do with a 1st to 2nd run consistency factor?


when I first started messing with boost, bearings didnt last like they should , using 20w-50 and "tighter" clearances. We opened the clearances up some and changed to a heavy oil (50w) and bearings have been perfect ever since.
in cooler air i would pre-heat it some, since I have started using 40w and everything is sill perfect. I dont pre-heat it up much anymore, lazy sometimes, but probably should


J.R. Baxter

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Abruzzi
 
Posts: 1558 | Location: Waxahachie | Registered: July 04, 2005Reply With QuoteReport This Post
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