How hot is too hot for checking cyl head w infared thermometer. At what temp should one shut bike off n let cool down?
How hot
- Thread starter smallblockmazda
- Start date
I think you'll be surprised. This thread here will help you out...
http://www.blasterforum.com/engine-13/temperature-compression-49492/
http://www.blasterforum.com/engine-13/temperature-compression-49492/
I see mid 300's all the time with my trail tech computer. Piston, plug, and cylinder all look perfect and are inspected all the time. I basically keep an eye on it and use the temp as a input when deciding to re-jet based on ambient temp conditions.
Your tempuratures are NORMAL!
I've had some folks say that my tempuratures are high,but they are wrong! They say that I should be running in the 200 to 220 degree range. WITH AN AIR COOLED ENGINE??? I don't think so. I wouldn't be making any power at those tempuratures. They have liquid cooled engines,and also refer to they're cars and trucks as expamples.
Give ma a beak! Lets base tempuratures in reality.
I on the other hand measure my tempuratures all the time and get educated.
They on the other hand "assume".
Go kart guys that run the yamaha KT 100 kart engines run 450 degrees plus!
Aircraft engines run in the same tempuratures.
Look at porsche.
Look at air cooled VW's
Look at the "clone class" go karts that run the 4 stroke harbor freight engines.
Etc,etc,etc
I say your good to go.
Proper jetting is the key.
You will have some what lower tempuratures if the humidity is higher.
Here is what I experienced...
My write up below,says that I am running the stock oil injection. I have since removed it,so that I can experiment with different oil ratios,and oils. I DID NOT remove it,because of all the myths out there that say "It breaks all the time" ,"It will fail", "My brother's cousins uncle's siters nephew had it stop working", "my bike blew up because it was still on the bike" etc,etc.
>>>> Ok, here are some updates on the performance of the head...
First off a little bit about the Blasters...
Both are stock stroke. The blue one is still on the 66mm bore,and mine is at a 66.50mm bore. Both have forged wiseco pistons,however I beleive that a cast piston would work perfectly!
The blue one is my buddy's its a 2002. Mine is the red and black 2003
They both have the same "aggressive trail ported" cylinders that are port matched to the engine case,V force 3 reed valve assemblies,stock vm26 carbs, no air box lids,Uni filters, stock gearing,and the stock "Fat Squishy" rear tires...don't make fun of them they are great in the desert and have saved our butts multiple times! The lower profile tires most of you run,reduce the ground clearance too much. You would be asking for trouble out here.
My buddy's blue 2002 is running an FMF Fatty pipe and FMF Turnine cor 2 silencer. Main jet is a #340
My Red and black 2003 is running a DMC Alien pipe and silencer. My main jet is also a #340
One last thing... We both run the stock oil injection with ZERO ISSUES! Works perfectly! We also both run redline 2 stroke oil. I was running yamalube (worked great),but wanted try some of the red stuff. I like it.
Before the head modification to my blaster, the bikes were a "dead heat" in a drag race. We repeated this multiple times,and then switched bikes,and drag raced some more...same results
Now we went out today and went for a desert ride in 94 degree weather. I was figuring that heat might be a factor. By the way...we are at 4,400 feet above sea level.
After afew hours in the ride,I can say that the head modification helped everywhere in the power band,but was very pronounced in the upper part of the power band. Hit the throttle,and HOLD ON! Feather the clutch a bit and REALLY HOLD ON! The power band hits like Thor's hammer! Very impressive!. It would without question,be even more noticeable without the porting. Porting on my engine was a HUGE improvement of the stock engine. The squish band head enhanced it (the porting) alot! I believe that you would notice a huge difference (bigger) on a stock engine.
I did bring my infrared laser thermometer with me to take temp reading on the trail. The cylinder temps on both bike were right in the 330 to 345 degree range after a hard run. The cylinder head teperatures were about 10 degrees to 15 degrees cooler than the cylinder tempuratures.
These tempuratures were right about on par with the tempurature readings when the bikes were bone stock. Now back to the drag racing...
After the ride,and we were heading home,we decided to drag race once again. Same method...drag race multiple times,then switch bikes and do it again. We would get both blasters up to an even speed in second gear side by side and then go for it!
The squish band hemi head was instantly noticeable,and it pulled on the other bike all the way through six gear each and every time! This is a modification that I would definitely recommend! I'm impressed and so is my buddy. Time to make another head for him! It impresses me how the increase in the efficiency of the "Burn" in the combustion chamber can make such a huge difference. It definitely has a crisper steadier idle. It revs up a bit more quickly,and full throttle is a big WOW! I like it!!!
If my bike isn't in the 30-32 HP range I'll lick the hair off my arms!
Here's a few pictures of the desert ride. It was hot and fun. The dead thing in the road made you ponder life. I'm thinking of adding some boysen ports next (top and botton) and also doing the "piston slot" modification to improve piston pin oiling. Stay tuned....
I've had some folks say that my tempuratures are high,but they are wrong! They say that I should be running in the 200 to 220 degree range. WITH AN AIR COOLED ENGINE??? I don't think so. I wouldn't be making any power at those tempuratures. They have liquid cooled engines,and also refer to they're cars and trucks as expamples.
Give ma a beak! Lets base tempuratures in reality.
I on the other hand measure my tempuratures all the time and get educated.
They on the other hand "assume".
Go kart guys that run the yamaha KT 100 kart engines run 450 degrees plus!
Aircraft engines run in the same tempuratures.
Look at porsche.
Look at air cooled VW's
Look at the "clone class" go karts that run the 4 stroke harbor freight engines.
Etc,etc,etc
I say your good to go.
Proper jetting is the key.
You will have some what lower tempuratures if the humidity is higher.
Here is what I experienced...
My write up below,says that I am running the stock oil injection. I have since removed it,so that I can experiment with different oil ratios,and oils. I DID NOT remove it,because of all the myths out there that say "It breaks all the time" ,"It will fail", "My brother's cousins uncle's siters nephew had it stop working", "my bike blew up because it was still on the bike" etc,etc.
>>>> Ok, here are some updates on the performance of the head...
First off a little bit about the Blasters...
Both are stock stroke. The blue one is still on the 66mm bore,and mine is at a 66.50mm bore. Both have forged wiseco pistons,however I beleive that a cast piston would work perfectly!
The blue one is my buddy's its a 2002. Mine is the red and black 2003
They both have the same "aggressive trail ported" cylinders that are port matched to the engine case,V force 3 reed valve assemblies,stock vm26 carbs, no air box lids,Uni filters, stock gearing,and the stock "Fat Squishy" rear tires...don't make fun of them they are great in the desert and have saved our butts multiple times! The lower profile tires most of you run,reduce the ground clearance too much. You would be asking for trouble out here.
My buddy's blue 2002 is running an FMF Fatty pipe and FMF Turnine cor 2 silencer. Main jet is a #340
My Red and black 2003 is running a DMC Alien pipe and silencer. My main jet is also a #340
One last thing... We both run the stock oil injection with ZERO ISSUES! Works perfectly! We also both run redline 2 stroke oil. I was running yamalube (worked great),but wanted try some of the red stuff. I like it.
Before the head modification to my blaster, the bikes were a "dead heat" in a drag race. We repeated this multiple times,and then switched bikes,and drag raced some more...same results
Now we went out today and went for a desert ride in 94 degree weather. I was figuring that heat might be a factor. By the way...we are at 4,400 feet above sea level.
After afew hours in the ride,I can say that the head modification helped everywhere in the power band,but was very pronounced in the upper part of the power band. Hit the throttle,and HOLD ON! Feather the clutch a bit and REALLY HOLD ON! The power band hits like Thor's hammer! Very impressive!. It would without question,be even more noticeable without the porting. Porting on my engine was a HUGE improvement of the stock engine. The squish band head enhanced it (the porting) alot! I believe that you would notice a huge difference (bigger) on a stock engine.
I did bring my infrared laser thermometer with me to take temp reading on the trail. The cylinder temps on both bike were right in the 330 to 345 degree range after a hard run. The cylinder head teperatures were about 10 degrees to 15 degrees cooler than the cylinder tempuratures.
These tempuratures were right about on par with the tempurature readings when the bikes were bone stock. Now back to the drag racing...
After the ride,and we were heading home,we decided to drag race once again. Same method...drag race multiple times,then switch bikes and do it again. We would get both blasters up to an even speed in second gear side by side and then go for it!
The squish band hemi head was instantly noticeable,and it pulled on the other bike all the way through six gear each and every time! This is a modification that I would definitely recommend! I'm impressed and so is my buddy. Time to make another head for him! It impresses me how the increase in the efficiency of the "Burn" in the combustion chamber can make such a huge difference. It definitely has a crisper steadier idle. It revs up a bit more quickly,and full throttle is a big WOW! I like it!!!
If my bike isn't in the 30-32 HP range I'll lick the hair off my arms!
Here's a few pictures of the desert ride. It was hot and fun. The dead thing in the road made you ponder life. I'm thinking of adding some boysen ports next (top and botton) and also doing the "piston slot" modification to improve piston pin oiling. Stay tuned....
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