Whipple Stage 2 Engine failure (2017)

[Cory S]

Is there a certain CHT where the rings get too expanded? I've hit 258 cht during some somewhat prolonged spirited driving in 95 degree weather with my boosted NA aluminator, no problems yet although I don't want to test it farther than around that temp. I'm on e50 so maybe that helps the cylinder temps? idk. Also are the aluminator pistons less prone to this breakage because they are forged?

OP do you know what your CHT's were?

I'm going to stay under 260 since I've hit that without problems on my setup/fuel. In the winter this should be easy I hope.

The combination of E50 and a stronger piston, absolutely provide a higher/longer resistance to piston ringland failure. The N/A Aluminators still run very tight ring gaps. (.009-.012”)

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[tdstuart]

Is there a certain CHT where the rings get too expanded? I've hit 258 cht during some somewhat prolonged spirited driving in 95 degree weather with my boosted NA aluminator, no problems yet although I don't want to test it farther than around that temp. I'm on e50 so maybe that helps the cylinder temps? idk. Also are the aluminator pistons less prone to this breakage because they are forged?

OP do you know what your CHT's were?

I'm going to stay under 260 since I've hit that without problems on my setup/fuel. In the winter this should be easy I hope.

258 CHT are too high imo. If you want to run these cars hard and hot then upgrade the cooling system. Performance Pack radiator + Upgraded water pump + 170* Reiche Thermostat is the move.

I don't even have the upgraded water pump and I can go 180mph (I'm n/a) and not get past about 225 CHT. And that's in the heat (95+ F). I think I've done pulls to 160 in about the 90-100 temp range and not gone over 210 CHT. Granted the car was not super hot when doing this but those upgrades will let you push the car really hard. Keep in mind CHT are not ring temps and at least for my car the CHT are actually just calculated off the coolant temp in the cylinder head.

 

[ice445]

258 CHT are too high imo. If you want to run these cars hard and hot then upgrade the cooling system. Performance Pack radiator + Upgraded water pump + 170* Reiche Thermostat is the move.

I don't even have the upgraded water pump and I can go 180mph (I'm n/a) and not get past about 225 CHT. And that's in the heat (95+ F). I think I've done pulls to 160 in about the 90-100 temp range and not gone over 210 CHT. Granted the car was not super hot when doing this but those upgrades will let you push the car really hard. Keep in mind CHT are not ring temps and at least for my car the CHT are actually just calculated off the coolant temp in the cylinder head.

It's reversed, the cht is a physical sensor in the head that measures the temperature of the aluminum. Then the car calculates coolant temp based on that

 

[tdstuart]

It's reversed, the cht is a physical sensor in the head that measures the temperature of the aluminum. Then the car calculates coolant temp based on that

Thanks for the correction got them reversed lmao.

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