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Discussion Starter #1
Comp Cams is making jets called MaxJet where the size is actually the size of the hole (i.e., part number MJ98 is a .098 size hole--none of the Holley secret code sh*t), and they are hex on the outside so you use a nut driver to install/remove (...and not possible gouge the flowing surface).

Seems like a good product... What say the experts???
 

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Comp Cams is making jets called MaxJet where the size is actually the size of the hole (i.e., part number MJ98 is a .098 size hole--none of the Holley secret code sh*t), and they are hex on the outside so you use a nut driver to install/remove (...and not possible gouge the flowing surface).

Seems like a good product... What say the experts???
Not to say I'm an expert, but from what I know, you'll have to sort out your tune-up. Holley jet sizes are numbered as to what they flow, not hole size. A 95 Holley jet isn't going to be the same as a 95 MaxJet. Also note that no two dia's are going to flow exactly the same just because they're the same size...Holley flow's their jets and numbers accordingly. Doubt if Comp does this.
 

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mo balls than $cents$
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it'd get confusing using orifice size. lots of holley jets have the same size hole, but different tapering on that hole for flow increase.
 

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Totaly different as far as numbers go, but ALLOT nicer jet!
As mentioned above you will have to establish a new baseline and familiarize yourself with them, but I think it is the way to go if you are a serious racer that actually tunes for the weather and expects the change to be right.
We have been using Max jets for as long as I can remember. We made a conversion chart for Holley to Max Jet years ago based on actual flow numbers, but I am sure I have it stashed in the "glory day's" archive and may be a little tough to locate (somewere in the attic!)!
 

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Discussion Starter #5 (Edited)
Totaly different as far as numbers go, but ALLOT nicer jet!
As mentioned above you will have to establish a new baseline and familiarize yourself with them, but I think it is the way to go if you are a serious racer that actually tunes for the weather and expects the change to be right.

Right on!
I think MaxJet is approaching the size/part# issue in a straight forward way. I read some literature that stated Holley's flow rating varied by 1.5% (which could mean you're not even on the size your intended to be), whereas the Maxjet hole size varied by less than .05%.

Thanks for the feedback...

Ps. MaxJet actually supplies a chart like you referred to, BTW.
 

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Comp Cams is making jets called MaxJet where the size is actually the size of the hole (i.e., part number MJ98 is a .098 size hole--none of the Holley secret code sh*t), and they are hex on the outside so you use a nut driver to install/remove (...and not possible gouge the flowing surface).
Bill, there is no "CODE SHIT" in Holley's jets. Each number represents approx. 2% change in flow. Since most weather stations give you the % in flow change you need to make, if you are useing Max Jets, you are now stuck with the task of figureing out the % change yourself. Do you know the % in flow change between a .098 hole and a .099? And you if can't change a jet without butchering it, leave it to someone who can.



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Totaly different as far as numbers go, but ALLOT nicer jet!
As mentioned above you will have to establish a new baseline and familiarize yourself with them, but I think it is the way to go if you are a serious racer that actually tunes for the weather and expects the change to be right.

Right on!
I think MaxJet is approaching the size/part# issue in a straight forward way. I read some literature that stated Holley's flow rating varied by 1.5% (which could mean you're not even on the size your intended to be), whereas the Maxjet hole size varied by less than .05%.

Thanks for the feedback...

Ps. MaxJet actually supplies a chart like you referred to, BTW.
Holley makes jets that are called tight tolerance that are within .05% if you feel you need them. Each jet number comes in 3 sizes. A #95 will be followed by a letter indicating where in falls inside Holleys tolerance, hi, middle or low. They slightly overlap so a 95L flows almost the same as a 94H. Didn't know you were jetting your deal that nats ass but it's nice to know they are there for you guys that need them. :D



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Holley makes jets that are called tight tolerance that are within .05% if you feel you need them. Each jet number comes in 3 sizes. A #95 will be followed by a letter indicating where in falls inside Holleys tolerance, hi, middle or low. They slightly overlap so a 95L flows almost the same as a 94H. Didn't know you were jetting your deal that nats ass but it's nice to know they are there for you guys that need them. :D
It's kinda like measuring with Plasti-gauge vs. a dial bore gauge. Just depends on what you want to do!!
If the Holley shit was spot on we would just use the carbs right out of the box!
As we have said in the past, for some close is good enough :p, but you have to remember, at some of our tracks 3hp is a tenth of a second in lap time, so you had better be "Nat's Ass" or you may get your's handed to you by the guy in the next garage stall!! :D
 

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Discussion Starter #11
Bill, there is no "CODE SHIT" in Holley's jets. Each number represents approx. 2% change in flow. Since most weather stations give you the % in flow change you need to make, if you are useing Max Jets, you are now stuck with the task of figureing out the % change yourself. Do you know the % in flow change between a .098 hole and a .099? And you if can't change a jet without butchering it, leave it to someone who can.
Actually, you're quite incorrect. The Holley part numbers are indeed a code, and not directly related to bore size. I have yet to have someone demonstrate what, exactly, those numbers represent, but it isn't 2% flow. The graph below indicates variance in "volume" from part number to successivley higher part number. They vary from less than 1% to nearly 6%. Consider that the quality control--or lack thereof--multiplies that by a factor of another 1.7%.

Thanks for menting Holley sells a higher quality part, but one has to question Holley's reasoning for not making that a standard for quality; at the least, for the size jets that would be considered for racing.


 

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Actually, you're quite incorrect. The Holley part numbers are indeed a code, and not directly related to bore size. I have yet to have someone demonstrate what, exactly, those numbers represent, but it isn't 2% flow. The graph below indicates variance in "volume" from part number to successivley higher part number. They vary from less than 1% to nearly 6%. Consider that the quality control--or lack thereof--multiplies that by a factor of another 1.7%.

Thanks for menting Holley sells a higher quality part, but one has to question Holley's reasoning for not making that a standard for quality; at the least, for the size jets that would be considered for racing.
Bill, no one ever said they represent a bore size!! They represent a flow change of approx 2%. If you have a need and then capacity to jet that accurately the sell "CLOSE LIMIT" jets. Why aren't they all close limit?COST



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Discussion Starter #13
Bill, no one ever said they represent a bore size!! They represent a flow change of approx 2%. If you have a need and then capacity to jet that accurately the sell "CLOSE LIMIT" jets. Why aren't they all close limit?COST
Bob, Bob, Bob.... Oh what shall we do. We're talking about BOATs here, this is no time to talk about money. When it comes to our hobby, money is but symbolic. Now, don't let this get you down. I know you mean well.
 

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Bob, Bob, Bob.... Oh what shall we do. We're talking about BOATs here, this is no time to talk about money. When it comes to our hobby, money is but symbolic. Now, don't let this get you down. I know you mean well.
sorry, I had a brain fart. It's the rest of the world that isn't interested in spending double for there jets when the standard issue ones get the job done. PS STILL RUNNING THE LAME ASS (AS IN CHEAP)DINOSAUROIL? Perhaps it's time to step up MONEYBAGS;)
http://www.jegs.com/i/Q-Racing/721/15W50QT/10002/-1/819591|10461



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Discussion Starter #15
sorry, I had a brain fart. It's the rest of the world that isn't interested in spending double for there jets when the standard issue ones get the job done. PS STILL RUNNING THE LAME ASS (AS IN CHEAP)DINOSAUROIL? Perhaps it's time to step up MONEYBAGS;)
http://www.jegs.com/i/Q-Racing/721/15W50QT/10002/-1/819591|10461
Based on YOUR feedback some time ago, I switched to Valvoline Conventional racing oil from the VR1. You see, I do listen to you!

I have read a lot on the synthetics, and they certainly have advantages. But since I change my oil after every weekend event, I question if the extra expense is warrented. I'm not sure I put enough time on the oil to realize the benefits of the synthetic.
 

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Percentage of change

If you try to figure the percentage of change between a .098 dia. and a .099 dia. there is an AREA missing from you calculations............Ray
 
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