FrontEngineDragsters.Org Forum
Technical => Matt Shaff's Engine Shop => Topic started by: L79_Acadian on May 27, 2014, 04:27:33 AM
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Hi, just wanting to know what oil weight to use in my stack injected small chevy. Its on methanol. Also
what plugs are recomended for the same setup. I need 3/4" reach,gasket seat plugs, for a magneto.
Thanks in advance
Roger
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Rodger:
I will assume this is a compression ratio around 12 to 1.
If the bearings clearances are typical bracket race: .0025-.003" we use 10-40 Brad Penn racing oil.
Everybody will have a different view on this but we have used that oil with ZERO problems.
Spark plugs are also a topic of preference. We have been using NGK plugs for the few years.
They are very easy to read and not over priced.
I would start with a R5671A-7. The short number is: 4091.
Tighten up the gap to .016-.018" for the mag.
Thats my 2 cents:
Matt
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"...I would start with a R5671A-7. The short number is: 4091...."
That's interesting Matt, I've been afraid that NGK heat range '7' was too warm for such application. I'm currently using '9' (R5672A-9), but definitely going warmer on my next set of spark plugs.
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-9 is two steps colder than the -7. NGK runs colder as the number goes higher on that series.
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-9 is two steps colder than the -7. NGK runs colder as the number goes higher on that series.
That's correct. As a matter of fact, I believe this applies to all NGK series.
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Rodger:
I will assume this is a compression ratio around 12 to 1.
If the bearings clearances are typical bracket race: .0025-.003" we use 10-40 Brad Penn racing oil.
Everybody will have a different view on this but we have used that oil with ZERO problems.
Spark plugs are also a topic of preference. We have been using NGK plugs for the few years.
They are very easy to read and not over priced.
I would start with a R5671A-7. The short number is: 4091.
Tighten up the gap to .016-.018" for the mag.
Thats my 2 cents:
Matt
X2. I' ve been running Brad Penn 20-50 for 3 yrs...no problems. Also running the same ngk R5671-7' s gapped @ .025 with MSD AL-6.
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Thank guys. Got the parts last nights
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remember the only real stupid question is the one you or me are afraid to ask 8) 8) 8) 8) 8) 8) 8) 8) 8)
steve m
hotrod 316
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We have found that a hot spark plug will show your tune-up quicker than a cold plug.
Seen guys struggle for a long time fighting it with a cold spark plug . . . . .
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remember the only real stupid question is the one you or me are afraid to ask 8) 8) 8) 8) 8) 8) 8) 8) 8)
steve m
hotrod 316
^ X 2
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I have approx 13.4:1 Called NGK Tech Line--( great and easy to get real human) they said same plug but -8 We buy them off ebay $19 a set delivered free
Len Hughes said tight gap with Vertex like .018 seems to be working well.
I have been using the newer Kendal GT-1 ( now I think Conoco in TX ) not the same as the old which is now Brad Penn BUT...it is cheap at $38 a case or so and seems to take the alky pretty well
I think Brad Penn is the best but man that stuff is expensive.
I ALWAYS use the brad penn with flat tappets
20w50 may be a little slower than thin oil but with the alky I love it.
On the dyno there IS power in thin oils but I think it just ain't worth it for the kind of running ( mostly show) that we do
Merry Christmas to all
I rebuilt a Powerglide front pump today--just could not stay out of the shop :)