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Post by dai9fxey on Oct 14, 2011 20:05:38 GMT 1
If you don't have a thermostat you should have a blanking sleeve fitted instead and the bypass hose should be blocked as well. Numbers 3 and 4 cylinders will get hotter due to poor water circulation. I used to run a 1297 semi short stroke engine and boy, did that thing get hot. Blanking sleeve, blocked bypass hose, heater in the car and a small auxilliary rad behind the grill, oh and a header tank just for good measure was just enough to keep it cool.  |
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Post by jackdaw on Oct 14, 2011 20:10:51 GMT 1
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Post by dai9fxey on Oct 14, 2011 20:35:24 GMT 1
A thermostat is there to control the flow of water until the engine gets warm.
The bypass hose does just that. when the thermostat is closed some water is allowed into the head water jacket to keep some coolant going through the system to stop air pockets and cavitation.
Having a blanking sleeve fitted instead of the thermostat takes longer for the engine to get warmed up, but it helps by giving far better coolant circulation, avoids cavitation and keeps No's 3 and 4 cylinders cooler.
Oh, and you don't need the troublesome bypass hose either.
The sleeve fits exactly where the thermostat goes and should be made of brass.
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Post by jackdaw on Oct 14, 2011 20:38:51 GMT 1
So on a 1275 engine where there is no bypass hose would you still need this blanking sleeve  Any pics if the said sleeve Daisy |
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Post by dai9fxey on Oct 14, 2011 20:39:10 GMT 1
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Post by jackdaw on Oct 14, 2011 20:42:56 GMT 1
Well I never knew that and I've never seen one of them either! (or if I have I didnt know what it was !!! )  Never too old to learn tho! ;D  ;D |
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Post by dai9fxey on Oct 14, 2011 20:46:03 GMT 1
Never too old to learn tho! Missed a word,,,,,,,,,,,,,very, should be in front of old.  |
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Post by jackdaw on Oct 14, 2011 20:49:06 GMT 1
Never too old to learn tho! Missed a word,,,,,,,,,,,,,very, should be in front of old. ;D Cheers Daisy ;D  |
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phill54
1170cc
70 mph in second gear come on baby[F4:phillip401]
Posts: 373
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Post by phill54 on Oct 14, 2011 22:05:25 GMT 1
cheers guys for all you help
danielc it is quit a special engine it is a 1380 and it produces about the 120 to 130 bhp it is a fully rally build engine
dai how does that thermostat thing work as on my engine i too dont have the bypass hose
i spoke to endaff today and he has some 4 core rads up there for me to try
also dai how do i go about puttin a header tank in there car does it just go between the top hose
and the thermostat housing would this help too when u say a auxilliary rad does that mean u had 2 rads on your car pal
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Post by dai9fxey on Oct 14, 2011 22:26:42 GMT 1
All you need to do is fit a blanking sleeve instead of a thermostat because you have the bypass blocked already. When fitting a header tank swop the rad cap for a non pressure type, connect the overflow pipe to a header tank and put the pressure cap on the header tank. All the header tank does is catch any coolant that gets forced out of the rad. when the engine cools the coolant in the header tank goes back to the rad. The auxilliary rad was only a heater matrix which was plumbed in between the heater and the top hose if I remember correctly. On a hot days rallying, when the temp started to rise the heater got turned on. It got a bit hot and sweaty in the Mini at times. |
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phill54
1170cc
70 mph in second gear come on baby[F4:phillip401]
Posts: 373
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Post by phill54 on Oct 14, 2011 22:44:31 GMT 1
hot and sweaty hahaha i like it i might have to put the heater back in then too help it a bit i will order one of them things tomorrow pal
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ljonez
turbo
Built not bought
Posts: 3,734
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Post by ljonez on Oct 14, 2011 23:49:16 GMT 1
Sorry not been on all day, I hate to say it but your fan is on backwards ! :.:.)
You have your mechanical fan pulling air through the rad and what looks like an mpi fan which also pulls air, so they are pulling against each other
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Post by jackdaw on Oct 15, 2011 9:10:27 GMT 1
This is the setup on mine. Dont know if this will help at all but have a look anyway.....   |
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Post by danielc on Oct 15, 2011 12:30:12 GMT 1
Am I correct in thinking that if you have a separate header tank then it should be the highest part of the system?
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Post by jackdaw on Oct 15, 2011 13:59:57 GMT 1
 Going on the principle that water doesnt like to flow uphill without a lot of mechanical help, I would assume you are correct!
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Post by dai9fxey on Oct 15, 2011 14:22:41 GMT 1
Most modern cars have header tanks and yes Daniel, the header tank or at least the pressure cap on the tank should be higher than the outlet / overflow pipe from the rad.
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gavinhendy
1380cc
Williams Car Care, [F4:gavin williams]
Posts: 1,485
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Post by gavinhendy on Oct 15, 2011 15:25:42 GMT 1
Hey Phill hope you get this sorted mate , I'm going to get those discs off this week if u still want them pal
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phill54
1170cc
70 mph in second gear come on baby[F4:phillip401]
Posts: 373
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Post by phill54 on Oct 15, 2011 15:34:51 GMT 1
yeah i do want them gav hows the lupo going
i hope i get it sorted too pal
going to try a 4 core rad too
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phill54
1170cc
70 mph in second gear come on baby[F4:phillip401]
Posts: 373
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Post by phill54 on Oct 16, 2011 22:21:49 GMT 1
quick update put one fan too push and one too pull today and drove down too llanelli and wasnt going slow and the car stayed around the 70 degrees
might be fixed
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ljonez
turbo
Built not bought
Posts: 3,734
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Post by ljonez on Oct 16, 2011 22:51:58 GMT 1
Did you turn around the mechanical fan? Not just rewire the electric one
The reason I ask is because most fans are uni-directional and although they can cope in reverse they are not as efficient.
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;D
Going on the principle that water doesnt like to flow uphill without a lot of mechanical help, I would assume you are correct! 
