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Author
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Topic: Slicks: Tubes; yea or nay?
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Rory McNeil
Gearhead Posts: 1687
From: Surrey, B.C. Canada
Registered: Nov 2000
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posted 05-21-2002 11:52 AM
   
Well, finally got the 428 Fairmont out to the track this year. I normally run my slicks (14x32)tubeless, as I think having minor slow air leaks thru the sidewalls an acceptable trade off for eliminating 20 lbs of natural rubber racing tubes. My tires used to lose only 1/2-1 lb per day when tubeless. Anyway, Last year, i slick got a small cut in the tread area, I had a patch put in, but I suppose due to the flexible nature of a slick, it don`t stay on very well. Since $800.00 (CDN) is out of the budget at this time, for new slicks, I dragged out the M/T drag tubes, & had them installed in both sides.Now the tires don`t lose any air, which is great, but I`m curious how much that extra 20 lbs of rotating weight is slowing me down. Anybody ever done a back to back comparision? I was about a tenth & a half & 2 MPH off my best numbers last year, but I also had a new belt driven water pump on the engine, plus it was fairly humid on Sunday.------------------
78 Fairmont 428 4 speed 10.20@130mph
80 Fairmont 302 5 speed 12.8@105mph
85 Mustang NHRA Stocker under construction, 302 5 speed
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jkilroy
Gearhead Posts: 1808
From: Vicksburg, MS
Registered: Dec 99
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posted 05-23-2002 12:15 PM
This was discussed in another post about Bogart wheels. Alex had some thoughts about rotating mass and unsprung weight. I think the number thrown out was .05 per 10 lbs, but it would be best to search for the postings. ------------------
Jay Kilroy
68' Fastback GT 390
"No such thing as a cam thats too big"
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Moneymaker
Administrator Posts: 27499
From: Lyons, IL, USA
Registered: May 99
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posted 05-23-2002 01:20 PM
SEAL UP THE TIRES WITH DISH WASHING SOAP PRIOR TO MOUNTING TO STOP SEAPAGE. No tubes ever if you want good 60 foot times.  ------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link
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capri man
Gearhead Posts: 7611
From: doerun, ga.
Registered: Nov 2000
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posted 05-23-2002 01:26 PM
your right rory, a patch will not stick to the inside of a slick. however i have heard good reports about the use of a patch/plug.
maybe someone can help us here. normally all your leakage is through the sidewalls. i soaped up my m/t slicks real good and they wont leak over a couple of lbs in a week.------------------
mike r
racing is real
everything else is just a game.
81 capri-7.56 @88mph 1/8
1.56 60 ft.
http://prestage.com/site/site_display.asp?SiteID=141
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Rory McNeil
Gearhead Posts: 1687
From: Surrey, B.C. Canada
Registered: Nov 2000
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posted 05-23-2002 03:26 PM
Alex, I HAD to put tubes in. One tire was going totally flat overnight, even if I put 20 psi in. You could hear it hissing out. It has a cut in the tread area, minor sidewall seepage I have lived with for years. Actually, my 60 fts wern`t too bad with the tubes,a 1.38, & 2 1.39`s. The best it has ever gone with these same slicks tubeless was 1.37. But I was more concerned about in high gear, thats where the car was slower. Right now, I have a new water pump hooked up to the crank, normally I use an electric water pump drive. So it could be a bit of each.------------------
78 Fairmont 428 4 speed 10.20@130mph
80 Fairmont 302 5 speed 12.8@105mph
85 Mustang NHRA Stocker under construction, 302 5 speed
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Moneymaker
Administrator Posts: 27499
From: Lyons, IL, USA
Registered: May 99
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posted 05-23-2002 03:42 PM
Dish washing soap will not fix cuts or punctures, that's for sure.  ------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link
IP: Logged | |
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