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Post by gitrdun on Mar 13, 2014 16:55:16 GMT -5
I bought a VDO temp gauge that mounts the ring probe under the #3 spark plug. Went for a spin and according to the gauge i was cruising at 400*F 3,000 RPM around 60mph. Aircooled .net website says critical temp for these motors is 425*. Am i going to cook the motor at 400*? If i step on it the temp obviously climbs imediately.
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Post by TexasIceMan on Mar 13, 2014 18:13:39 GMT -5
Running with the head temperature at 400*F is too high. I would think in the range of 325 - 340*F would be more "normal". You might want to type in "engine temperature" in the Search box [top right corner] and read some of the other threads that are on this site. I remember reading about someone have a similar problem.
Also, you might want to test your temperature sensor to make sure it is giving you good data. Water boils at 212*F (at sea level). If you have a Candy thermometer or Wax Candle thermometer you can measure higher temperatures.
Good luck & keep us posted.
TIM
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Post by jspbtown on Mar 13, 2014 19:39:09 GMT -5
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Post by Dan MacMillan on Mar 18, 2014 19:13:47 GMT -5
do you have all the cooling tins in place, working thermostat, hot/cold separation?
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Post by horen2tas on Mar 19, 2014 10:11:32 GMT -5
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Post by TexasIceMan on Mar 19, 2014 11:47:35 GMT -5
When I first saw hern2tas post of the Boy Scout I thought it didn't apply to this thread. When I read it, I thought that was TOO FUNNY!!!
TIM
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Post by gitrdun on Mar 19, 2014 20:33:56 GMT -5
I do not have the lower cylinder tins. Checked my pile of old VW parts and couldnt find any so looks like ill be ordering some. My vanes are wired open as the thermostat system is gone. It seems to heat right up to running temp as soon as i reach 55mph.
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Post by Dan MacMillan on Mar 22, 2014 8:59:55 GMT -5
Can you post pictures of the engine/tins/fan/ etc. Are you using a "power pulley" how is the belt tension? What is your timing set at?
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Post by gitrdun on May 18, 2014 21:09:03 GMT -5
I drove the Bradley today with lower tins in place, still cruising at 400*F. I retarded the ignition a little and it seemed to cool it off by a hair. Caused a low speed stumble and a lot of backfiring when letting off the gas but it actually seems to pull a little harder through the mid range. I have an air scoop i bought awhile back to mount on the rear deck but i cant yet find the courage to cut a big hole in the rear deck.
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Post by Dan MacMillan on May 23, 2014 22:13:11 GMT -5
Did you separate the hot side from the cold? If not you are trying to cool your engine with hot air. Not going to happen. Pictures please
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Post by gitrdun on May 26, 2014 13:32:34 GMT -5
No i havent seperated top and bottom. Not sure how to do that on the Bradley 1 without a lot of modifying. Thats the main reason i thought adding a scoop to the top right over the engine might help let some cool air in from the top side. The engine compartment on the Bradley GT1 is pretty much wide open, there is no side panels or anything, basically the body is just an open shell and sits over the engine.
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geddes66
Junior Member
Now I am an instructor at the RTS-M, Camp Roberts CA. Teaching new Army mechanics.
Posts: 87
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Post by geddes66 on May 31, 2014 1:39:51 GMT -5
Before you go to the trouble of "separating the top and bottom" go get yourself a cheap electronic indoor/outdoor thermometer. put it in your car and put the probe near the fan intake. Go for a drive. check to see what the difference in between the ambient temp and your under hood temp as you roll. Mine was only about 4 degrees warmer in the engine compartment while at speed. If yours is close, then 'heat recycling' is not your problem.
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Post by gitrdun on Jun 7, 2014 16:31:46 GMT -5
OK i took some readings from a laser temp gun after going for a spin. The engine temp gauge read 350* after sitting for a minute at idle after a drive. I pointed the laser at the exhaust flange where it bolts to the head and got 320*, cant really get a good reading from the heads from all the tin in the way. I also pointed it towards the top of the doghouse tin and it read about 120*, it is 81* outside right now. So does that mean i am recycling the hot air from the engine area or would 120* under the hood be about normal?
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Post by Dan MacMillan on Jun 12, 2014 7:12:40 GMT -5
yup
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Post by gitrdun on Jun 12, 2014 21:33:06 GMT -5
What are you saying yup to? Recycling hot air or that being a normal temp under the hood?
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Post by Dan MacMillan on Jun 12, 2014 21:44:02 GMT -5
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Post by 48flatbed on Jun 13, 2014 18:11:10 GMT -5
I drove my GT1 to work today (48 miles one way). It is about half interstate at 65 mph and the rest is state hiway at 55, last mile is regular roads at 35 mph. When I got home I immediately took a digital thermometer and measured crankcase (just below generator stand) at 190 F, Heads on bottom at 310 F. I did not measure doghouse temp but it was 88 degrees here today. I have all the tins on the engine except for the one that goes across the rear under the generator belt. I have done nothing to separate hot to cold side. I don't know if humidity makes any difference but it seems to run cooler in June than in August even on days when the ambient temp is similar (within 5 degrees).
Jon
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Post by 48flatbed on Jun 14, 2014 6:09:50 GMT -5
I drove the Ghia to work today. It has all tins in place and all hot/cold separation seals intact. Temps on it were Crankcase - 207, Heads from below - 290, top of doghouse - 106, with ambient today of 70 degrees. So it looks like with cold/hot separation the heads were a little cooler. I understand this is a comparison of completly different vehicles but the engine/cooling systems are very close (the Ghia is single port while the Bradley is DP).
Jon
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Post by mj on Jun 15, 2014 9:42:32 GMT -5
No i havent seperated top and bottom. Not sure how to do that on the Bradley 1 without a lot of modifying. The black areas on the rear right and left are steel plates bolted to the engine compartment walls. This engine runs cool!  |
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