Can anyone tell me the formula for converting MPH into engine RPMs on a 73 transporter (4th gear, stock transmission and stock size tires).
I'm just curious as to how many RPMs my type 1 engine was turning when it developed a big hole in the top of the case yesterday going up I-75. By the way, one really shouldn't attempt to set an interstate speed record in a bus!
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Zen Hendricks
"You can observe a lot by watching." -- Yogi Berra
Scenic City Volks Folks, Chattanooga, TN -- Where Air Meets Water! http://www.volksfolks.org
MPH to RPM
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Pillow
- Posts: 2940
- Joined: Mon Oct 15, 2001 1:01 am
MPH to RPM
I do not remember where the calculators are on the web, but sorry to hear of your engine explosion 
Usually if you blow a hole in the case the rod bolt gave up and shot the rod cap out. Which could be an engine heat issue or oiling issue.
... People swear that the T1 rods are good for like 6500 RPM, but from what I have sean that is not true. On the next engine build splurge on ARP rod bolts
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Adrian Pillow
'66 VW Westfalia - "Biscuit"
'67 VW Deluxe Westfakia - "Dino"
'79 Porsche 911 SC - "Cochese"
Usually if you blow a hole in the case the rod bolt gave up and shot the rod cap out. Which could be an engine heat issue or oiling issue.
... People swear that the T1 rods are good for like 6500 RPM, but from what I have sean that is not true. On the next engine build splurge on ARP rod bolts
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Adrian Pillow
'66 VW Westfalia - "Biscuit"
'67 VW Deluxe Westfakia - "Dino"
'79 Porsche 911 SC - "Cochese"
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steve_s
- Posts: 75
- Joined: Fri Sep 01, 2000 12:01 am
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Zen
- Posts: 387
- Joined: Fri May 25, 2001 12:01 am
MPH to RPM
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Pillow:
Usually if you blow a hole in the case the rod bolt gave up and shot the rod cap out. Which could be an engine heat issue or oiling issue.<HR></BLOCKQUOTE>
I think you got it right Pillow. Judging from the looks of the straight rod cap that was laying in the engine bay and the pieces of broken rod bolt, I was thinking that something must have stopped up an oil galley and cut the oil to the #4 rod, the rod overheated and one of the bolts gave way. The engine wasn't hot (using the dipstick test, it was about it's normal operating temperature when I stopped) but that rod cap was cooked. There was no warning whatsoever. No unusual noise, no loss of power, nothing . . . just a sudden BANG and lots of smoke. I'll tear it apart soon and see I can figure out for sure what happened, and hopefully find one or two salvagable parts in it.
Oh well, I had assembled the engine from used parts and had under $50 tied up in it. The bottom end was on an old dune buggy I bought several years ago and I had been running it on my 69 Baja for over a year. It was burning oil like crazy, but had excellent oil pressure and the end play was good. I needed an engine in a hurry last fall so I drive the bus to FL Bug Jam, and since it was a universal case, I pulled the engine off my Baja, slapped a set of used (but very low milage) piston/cylinders that I had picked up at a swap meet for $30 and a set of used heads on it and I've been giving it hell ever since. In addition to lots of high speed (for a type 1 powered bus anyway) interstate travel, I've used the bus several times to tow bugs. It held together for over 15,000 miles so I can't complain about it. I'd give $50 for another one just like it any day!
Thanks for the calculator link Steve!
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Zen Hendricks
"You can observe a lot by watching." -- Yogi Berra
Scenic City Volks Folks, Chattanooga, TN -- Where Air Meets Water! http://www.volksfolks.org
[This message has been edited by Zen (edited 06-19-2002).]
Usually if you blow a hole in the case the rod bolt gave up and shot the rod cap out. Which could be an engine heat issue or oiling issue.<HR></BLOCKQUOTE>
I think you got it right Pillow. Judging from the looks of the straight rod cap that was laying in the engine bay and the pieces of broken rod bolt, I was thinking that something must have stopped up an oil galley and cut the oil to the #4 rod, the rod overheated and one of the bolts gave way. The engine wasn't hot (using the dipstick test, it was about it's normal operating temperature when I stopped) but that rod cap was cooked. There was no warning whatsoever. No unusual noise, no loss of power, nothing . . . just a sudden BANG and lots of smoke. I'll tear it apart soon and see I can figure out for sure what happened, and hopefully find one or two salvagable parts in it.
Oh well, I had assembled the engine from used parts and had under $50 tied up in it. The bottom end was on an old dune buggy I bought several years ago and I had been running it on my 69 Baja for over a year. It was burning oil like crazy, but had excellent oil pressure and the end play was good. I needed an engine in a hurry last fall so I drive the bus to FL Bug Jam, and since it was a universal case, I pulled the engine off my Baja, slapped a set of used (but very low milage) piston/cylinders that I had picked up at a swap meet for $30 and a set of used heads on it and I've been giving it hell ever since. In addition to lots of high speed (for a type 1 powered bus anyway) interstate travel, I've used the bus several times to tow bugs. It held together for over 15,000 miles so I can't complain about it. I'd give $50 for another one just like it any day!
Thanks for the calculator link Steve!
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Zen Hendricks
"You can observe a lot by watching." -- Yogi Berra
Scenic City Volks Folks, Chattanooga, TN -- Where Air Meets Water! http://www.volksfolks.org
[This message has been edited by Zen (edited 06-19-2002).]
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Vanman_spud
- Posts: 77
- Joined: Sat Apr 13, 2002 1:01 am
MPH to RPM
Can't remember the exact ratio for a '73 I think its 17mph per 1000rpm.
I know that it's definatly 17.2 per 1000 for a '68 e.g. 17.2 x 4 = 68.8 mph at 4000 rpm.
I know that it's definatly 17.2 per 1000 for a '68 e.g. 17.2 x 4 = 68.8 mph at 4000 rpm.
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Vanman_spud
- Posts: 77
- Joined: Sat Apr 13, 2002 1:01 am
MPH to RPM
Can't remember the exact ratio for a '73 I think its 17mph per 1000rpm.
I know that it's definatly 17.2 per 1000 for a '68 e.g. 17.2 x 4 = 68.8 mph at 4000 rpm.
Hmmm... I didn't post this twice. Honest!
[This message has been edited by Vanman_spud (edited 06-27-2002).]
I know that it's definatly 17.2 per 1000 for a '68 e.g. 17.2 x 4 = 68.8 mph at 4000 rpm.
Hmmm... I didn't post this twice. Honest!
[This message has been edited by Vanman_spud (edited 06-27-2002).]