Max Jets and pin guages

Lou SG2340 · 02-25-2009, 01:20 PM

Quote:

Originally Posted by 69Cobra

One more question for you. Now correct me if I'm wrong but doesn't the holley jets go by flow and the max jets by orifice size? Just trying to get my thinking straight here.

Thanks

Holley jets are sized by flow. Max Jets are drilled. Some carb builders take Holley jets & drill them out.

Pin & drill sets are nice to have. I got mine from another racer but don't know where he got them

NORMAN BARNARD · 02-25-2009, 01:39 PM

Holley jets are rated by cc's per minute flow in volume. If you have access to a flow bench it is very easy to match the required jet to the dry air flow of the carburetor, then from there it all becomes a function of the atomization circuit and the fuel curve.

On the question of the pin gauge diameter: Example a .010 diameter:
Minus = .009
plus = .011

George Mirza · 02-25-2009, 08:35 PM

A good guage pin set will run like this

minus .010 pin = .0097-.0099

plus .010 pin = .0100-.0102

Try MSC, McMaster Carr or Grainger. MSC is you best bet, they are the Walmart of industrial tool supplies.

Most sets run from .011-.060 and then .061-.250. The bigger sets can get pretty expensive.

Another way is to use the shanks of the drills in a number drill set. You don't have every .001 increment but you can get an idea of the hole size. They run from #60 (.040) up to a #1 (.228 I think).

02-25-2009, 01:39 PM	#2
NORMAN BARNARD Member Join Date: Mar 2006 Location: EL PASO, TEXAS Posts: 156 Likes: 0 Liked 2 Times in 2 Posts	Re: Max Jets and pin guages Holley jets are rated by cc's per minute flow in volume. If you have access to a flow bench it is very easy to match the required jet to the dry air flow of the carburetor, then from there it all becomes a function of the atomization circuit and the fuel curve. On the question of the pin gauge diameter: Example a .010 diameter: Minus = .009 plus = .011

02-25-2009, 08:35 PM	#3
George Mirza Senior Member Join Date: Jan 2002 Location: North Attleborough Ma. Posts: 522 Likes: 0 Liked 0 Times in 0 Posts	Re: Max Jets and pin guages A good guage pin set will run like this minus .010 pin = .0097-.0099 plus .010 pin = .0100-.0102 Try MSC, McMaster Carr or Grainger. MSC is you best bet, they are the Walmart of industrial tool supplies. Most sets run from .011-.060 and then .061-.250. The bigger sets can get pretty expensive. Another way is to use the shanks of the drills in a number drill set. You don't have every .001 increment but you can get an idea of the hole size. They run from #60 (.040) up to a #1 (.228 I think).

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