Cross Country
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That Girl Racing
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- Real Name: Peter
Cross Country
Kenny. Sorry but I can see were I seemed sarcastic in my last post. I was not . Pipe pressure determines how much fuel the carbs will draw. It changes with air density. Lets say we establish 3.5 lbs of pressure at 1000 ft of corrected altitude to be optimal. Nexy weekend we are at 2500 ft and the pipe pressure is 2.75 lbs. At that point I will tighten up the stinger diameter to bring the pressure back up. The comression ratio is also part of this . Typically I would increase compression by half a point as the available oxygen is less than it was at 1000 ft. Theoretically main jet size should never have to be changed when pipe pressure and compression are varied relative to air density though in practice at the track we still make jet adjustments. Peter
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ICCSF 108
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- Real Name: Kenny Heins, AKA Grumpy
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Cross Country
Peter, At what difference of elevation would you need to tighten up the stinger to be optimal? every 500 ft or more or less??
This is very interesting, not that I ever plan on racing again but just the fact that snowmobile racing has gotten to be so involved...
Kenny
This is very interesting, not that I ever plan on racing again but just the fact that snowmobile racing has gotten to be so involved...
Kenny
AKA: Kenny, Grumpy, Mr. Richard Head
"I Hunt For it, Purchase it, Haul it, Sometimes Repair it, Sometimes Break it, Then Fix it Again, Label it, Warehouse it, Talk About it, So NOW, HOW Can I Take Any Less $$ For It?"
"God I love the smell of KLOTZ in the morning, That smell, you know that Gasoline/Oil Smell, MAKES the whole place SMELL like.. LIKE VICTORY. You know someday the 2 strokers are gonna end..."
Do Anti-War Protesters have reunions? If so what do they TALK about?
"I Hunt For it, Purchase it, Haul it, Sometimes Repair it, Sometimes Break it, Then Fix it Again, Label it, Warehouse it, Talk About it, So NOW, HOW Can I Take Any Less $$ For It?"
"God I love the smell of KLOTZ in the morning, That smell, you know that Gasoline/Oil Smell, MAKES the whole place SMELL like.. LIKE VICTORY. You know someday the 2 strokers are gonna end..."
Do Anti-War Protesters have reunions? If so what do they TALK about?
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That Girl Racing
- Posts: 683
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- Real Name: Peter
Cross Country
I weld 7/16 nuts on the stingers and screw bolts in to close off the pipe, so it is done gradually. Hard to say what the #s are but I would say you could be 2mm different between minus 1000 ft and plus 3000. That is providing the stinger is right to begin with and also the distance the sled is racing. The stinger for a 500ft grass drag would burn a motor down in a quarter mile. Peter
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Jack Frost
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- Location: Allanburg, Ontario
Cross Country
Hi Peter, Do you make all you own stingers for your race sled or do you have someone that does it for you?
1978 340 CC Liquifire
I once bought my kids a set of batteries for Christmas with a note on it saying, toys not included
I once bought my kids a set of batteries for Christmas with a note on it saying, toys not included
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That Girl Racing
- Posts: 683
- Joined: Fri Jul 22, 2005 12:00 am
- Real Name: Peter
Cross Country
Depends, Jaws Performance makes our pipes and then we fit the stingers and pipes in the chassis. Three cylinder motors and three race pipes are a very tight fit in a Rev chassis. We also use CrankShop and Stanley pipes. Every motor is different. We dyno them with different pipes till we find the "happiest" combination.
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The S Man
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- Real Name: Ron Sonnek
- Location: Barnyard, southern Mn.
Cross Country
Man,
Thanks for all that info!!!! Very interesting to say the least. I have an old set of pipes for my drag sled. The brand is called MIDDLE SEX have you ever heard of these? It is interesting as the stingers are of vairied lenghts very minor but still different. They seem to work great for my application on a triple SLP motor...
Thanks for all that info!!!! Very interesting to say the least. I have an old set of pipes for my drag sled. The brand is called MIDDLE SEX have you ever heard of these? It is interesting as the stingers are of vairied lenghts very minor but still different. They seem to work great for my application on a triple SLP motor...
She thinks all my jokes are corny,Convict movies make her horny
She likes ketchup on her scrambled eggs, Swears like a sailor when she shaves her legs.....John Prine
She likes ketchup on her scrambled eggs, Swears like a sailor when she shaves her legs.....John Prine
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That Girl Racing
- Posts: 683
- Joined: Fri Jul 22, 2005 12:00 am
- Real Name: Peter
Cross Country
Never heard of them. PSI and Pro5 pipes were common on those motors. Stinger diameter is more important than slightly different length.
Cross Country
Peter,
What kind of A/F ratio are you seeing with the O2 sensor? Optimum would be 14.7, correct? Do you see a benefit goin on either side of that?
Mark
What kind of A/F ratio are you seeing with the O2 sensor? Optimum would be 14.7, correct? Do you see a benefit goin on either side of that?
Mark
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That Girl Racing
- Posts: 683
- Joined: Fri Jul 22, 2005 12:00 am
- Real Name: Peter
Cross Country
Yes 14.7 is supposed to be optimum. Our stuff seems to want to be around 13/1