How cam choice affects engine heating with supercharger?
Thread Starter
On The Tree
Joined: Aug 2009
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How cam choice affects engine heating with supercharger? I have bit of problem with heat producing in my supercharged LS3. It heats up really really quick when using it capabilities. I have big *** 3row aluminium radiator, should have good airflow, electric water pump and big oilcooler. And i´m using E85 as fuel which should help this also. 15psi and 770whp
I´m still using N/A camshaft:
227/238, 0.583"/.600"
LSA/ICL: 112/108
Would a different cam be anykind of answer to this problem, or am i missguided on this?
I´ve been thinking LS9 cam or Comp 227/243, 0.614/0.624" and LSA114
What are estimates how much would be achieved on powerwise, or would it reduce heating?
Manual trans 2gen camaro, and it´s mainly in drifitng use.
I´m still using N/A camshaft:
227/238, 0.583"/.600"
LSA/ICL: 112/108
Would a different cam be anykind of answer to this problem, or am i missguided on this?
I´ve been thinking LS9 cam or Comp 227/243, 0.614/0.624" and LSA114
What are estimates how much would be achieved on powerwise, or would it reduce heating?
Manual trans 2gen camaro, and it´s mainly in drifitng use.
Thread Starter
On The Tree
Joined: Aug 2009
Posts: 135
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It just heat up really fast, i don´t let it overheat, but it intends to run hot. Let´s say that it heats from 180F to 210F in 30seconds pull.
Don´t remember fan specs anymore but should be enough, and this has been problem also on wheel dynos with really big fans, and also in track racing. So fan or drifitng is not the issue.
Other thing is ignition advance, we are in 10 degree range, or even under. And E85...
Don´t remember fan specs anymore but should be enough, and this has been problem also on wheel dynos with really big fans, and also in track racing. So fan or drifitng is not the issue.
Other thing is ignition advance, we are in 10 degree range, or even under. And E85...
TECH Fanatic
Joined: Oct 2015
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From: Pittsboro, IN
It just heat up really fast, i don´t let it overheat, but it intends to run hot. Let´s say that it heats from 180F to 210F in 30seconds pull.
Don´t remember fan specs anymore but should be enough, and this has been problem also on wheel dynos with really big fans, and also in track racing. So fan or drifitng is not the issue.
Other thing is ignition advance, we are in 10 degree range, or even under. And E85...
Don´t remember fan specs anymore but should be enough, and this has been problem also on wheel dynos with really big fans, and also in track racing. So fan or drifitng is not the issue.
Other thing is ignition advance, we are in 10 degree range, or even under. And E85...
Low ignition timing = high EGT's which will ultimately transfer into the coolant. Try advancing ignition timing a bit. You should be able to throw in more with E85. I have seen EGT's drop by 50 degrees F per degree of advance on some setups. You could potentially drop a couple hundred degrees here with another 5-6 degrees timing...not to mention the additional power to be had.
Thread Starter
On The Tree
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We´ve played quite a lot with timing, in different dynos and couple of different tech guys. I´m now 1 or 2 degrees down, what´s best on powerwise, and that should be minimum safe marginal.
It just dont stand more than that.
But no one sees that cam cam / timing could be isuue on this?
It just dont stand more than that.
But no one sees that cam cam / timing could be isuue on this?
I would flip it around. How could cam timing cause the engine to overheat? Unless it was installed wrong and severely retarded or something. Have you put a timing light on it to see if commanded equals actual? You trivialize the fans when factory fans move like 4500cfms and most aftermarket fans are like half that.
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Why are you worried about how fast is "warms up" or goes from 180-210? Why are you trying to limit how fast it does so?
If it overheats or runs extremely hot during extended runs, eg. coolant gets over 240* or oil over 280* then I would worry. Doesn't make to much sense to worry about how fast the engine warms up...heck that's actually a good thing because an engine not at operating temp is not performing properly and it's causing extra wear. So an engine that quickly gets to 210* operating temperature is preferred over one that takes a long long time.
If it overheats or runs extremely hot during extended runs, eg. coolant gets over 240* or oil over 280* then I would worry. Doesn't make to much sense to worry about how fast the engine warms up...heck that's actually a good thing because an engine not at operating temp is not performing properly and it's causing extra wear. So an engine that quickly gets to 210* operating temperature is preferred over one that takes a long long time.
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From: Norn Iron
No, the cam is not the problem.
Cam timing perhaps if it was a mile off...but the engine would probably perform badly too or show some symptoms of bad cam timing.
And you say it "should" have good airflow. It either does or does not.
And I'd also say most electric water pumps are crap, they flow nowhere near what a good mechanical pump will flow, especially at higher rpm.
So does the radiator have good airflow ?
Does the temp rise over 210degF ?
What oil temps are you seeing ?
What shape/size etc is the radiator and is the cooling system configured sensibly ?
Fans....suck, blow ? details ? do they cover the entire core, are they ducted ? details ?
You say supercharged....what type of supercharger ? details ?
Cam timing perhaps if it was a mile off...but the engine would probably perform badly too or show some symptoms of bad cam timing.
And you say it "should" have good airflow. It either does or does not.
And I'd also say most electric water pumps are crap, they flow nowhere near what a good mechanical pump will flow, especially at higher rpm.
So does the radiator have good airflow ?
Does the temp rise over 210degF ?
What oil temps are you seeing ?
What shape/size etc is the radiator and is the cooling system configured sensibly ?
Fans....suck, blow ? details ? do they cover the entire core, are they ducted ? details ?
You say supercharged....what type of supercharger ? details ?
Have you compared actual coolant temps with a temp gun vs what the temp sensor is telling the gauge?
Is there a possibility that there might be a pocket of air on the sensor?
Is there a possibility that there might be a pocket of air on the sensor?