Hi folks,
I'm all geared up with great anticipation for the Angouleme centenary race on Sunday, after some hectic weeks getting the car finished it's now tested on the road and goes well apart from cooling issues.
Are there any racers out there with pumped cooling systems and might be able to advise me on flaws in my layout?
The car flies along, and will stay at 70-80 degrees C on a level road at 30-40mph. But as soon as you use the throttle any more (like accelerating up a hill) it quickly boils.
The engine has an Aisin supercharger, a waterpump (suzuki gsxr I think) driven at engine speed & a W.H repro head with dry deck and a solid copper gasket. This was done with the intention of avoiding blown head gaskets. The blower is geared for 7-8psi.
Coolant goes from the bottom of the rad to the pump, out the pump into the front of the cylinder block on the valve side, out the back of the block, back into the rear of the cylinder head, out the front of the head in the normal place and up to the top of the radiator.
The radiator is a repro midget 1275 aftermarket aluminium job and the coolant header tank is a modernish (1980s) plastic one with a pressure-vent style cap. The fittings added to take the coolant into the block and out the rear back to the head are quite small (16mm internal).
If anyone has experience with similar cars (pigsty/750mc racers?) and could drop me any hints that would be a great help. Otherwise I fear I'll be on the sidelines watching the rest of the race after overheating on lap 1!
Regards to all & if anyone else is heading to Angouleme then see you there.
Sam Archer (aka Dirk)
![[Image: IMG_20220914_192548%20mod.jpg.opt1160x87...60x870.jpg]](https://1930austin.yolasite.com/resources/IMG_20220914_192548%20mod.jpg.opt1160x870o0%2C0s1160x870.jpg)
I'm all geared up with great anticipation for the Angouleme centenary race on Sunday, after some hectic weeks getting the car finished it's now tested on the road and goes well apart from cooling issues.
Are there any racers out there with pumped cooling systems and might be able to advise me on flaws in my layout?
The car flies along, and will stay at 70-80 degrees C on a level road at 30-40mph. But as soon as you use the throttle any more (like accelerating up a hill) it quickly boils.
The engine has an Aisin supercharger, a waterpump (suzuki gsxr I think) driven at engine speed & a W.H repro head with dry deck and a solid copper gasket. This was done with the intention of avoiding blown head gaskets. The blower is geared for 7-8psi.
Coolant goes from the bottom of the rad to the pump, out the pump into the front of the cylinder block on the valve side, out the back of the block, back into the rear of the cylinder head, out the front of the head in the normal place and up to the top of the radiator.
The radiator is a repro midget 1275 aftermarket aluminium job and the coolant header tank is a modernish (1980s) plastic one with a pressure-vent style cap. The fittings added to take the coolant into the block and out the rear back to the head are quite small (16mm internal).
If anyone has experience with similar cars (pigsty/750mc racers?) and could drop me any hints that would be a great help. Otherwise I fear I'll be on the sidelines watching the rest of the race after overheating on lap 1!
Regards to all & if anyone else is heading to Angouleme then see you there.
Sam Archer (aka Dirk)