Over heating and vapor locking

[Tchamp]

I have found out on my Robin air- subaru EH 72-2 in my 2425 that makes a BIG difference on its cooling ability if you get some foam padding from walmart and fill the gaps between the engine and the tub of the machine. You can get is usually in the arts and craft isles. I get the one that is 2 inches thick and use a box cutter to cut to size. I put the foam against the front plastic cover shroud stuffed in between it and the engine tub.Be careful on the oil cooler side of the engine not to cover up the oil cooler but put the foam around the oil cooler as to direct the heated air to the rear of the machine. We just want to block off the ability of the engine to pull the hot air from the rear of the engine compartment. put the foam inside the mount stand so the only air that the engine is pulling is from the two grills on the front of the tub. The problem is when the engine is runnind its sucking the hot air in from the oil cooler as well as from the rear from the engine as well as the heat from the exhaust. When that is eliminated it draws fresh air from the two vents and keeps the temps down as well as help eliminate the vaporlocking. I also installed a electric fuel pump in the front tub to eliminate the fuel routing into the hot cylinder head away from the heat. I sourced the fuel pump from Amazon for around 11.00 ( i got two, one for the machine and one for the spare part shelf as well.)This works well for me.i lnow i have mentioned this before but felt going into a little more depth may help someone out there a little more.

 

[bmaverick]

I have found out on my Robin air- subaru EH 72-2 in my 2425 that makes a BIG difference on its cooling ability if you get some foam padding from walmart and fill the gaps between the engine and the tub of the machine. You can get is usually in the arts and craft isles. I get the one that is 2 inches thick and use a box cutter to cut to size. I put the foam against the front plastic cover shroud stuffed in between it and the engine tub.Be careful on the oil cooler side of the engine not to cover up the oil cooler but put the foam around the oil cooler as to direct the heated air to the rear of the machine. We just want to block off the ability of the engine to pull the hot air from the rear of the engine compartment. put the foam inside the mount stand so the only air that the engine is pulling is from the two grills on the front of the tub. The problem is when the engine is runnind its sucking the hot air in from the oil cooler as well as from the rear from the engine as well as the heat from the exhaust. When that is eliminated it draws fresh air from the two vents and keeps the temps down as well as help eliminate the vaporlocking. I also installed a electric fuel pump in the front tub to eliminate the fuel routing into the hot cylinder head away from the heat. I sourced the fuel pump from Amazon for around 11.00 ( i got two, one for the machine and one for the spare part shelf as well.)This works well for me.i lnow i have mentioned this before but felt going into a little more depth may help someone out there a little more.

You are down in GA. What oil for hot season are you running? SAE 30 maybe? And is there room to add in an engine oil cooler?

I like your present solutions too.

 

[Tchamp]

You are down in GA. What oil for hot season are you running? SAE 30 maybe? And is there room to add in an engine oil cooler?

I like your present solutions too.

I just upgraded my oil coolerwith this one i bought on ebay. The difference is day and night, it made a BIG difference, my stump grinder isnt enemic anymore.
With putting the foam padding in and around the cowling of the engine my oil temp is running around 230 i will send pics of how i did the foam later.

Here’s the pics of how i did the padding around my engineView attachment 873740View attachment 873741View attachment 873742View attachment 873743
Note where i blocked the air from flowing under the engine mount assembly that i am pointing out, also the last two pics are showing how I redirected the air flow from my oil cooler to the rear of motor. It was originally flowing upward and blowing across my fuel lines causing the vapor locking condition. I put the foam around the two sides of oil cooler to direct the hot air to the rear of the engine, eliminating the vapor locking.i am running walmart brand 15-40 in my hydraulics and synthetic 10-30 in my engine.

 

[oosik]

That is a nice, clean looking upgrade. However - you talk about different operating conditions.

You down there in Georgia trying to keep thing cool. Up here in NE WA state - I'm still waiting for summer to kick in.

Yesterday - just at dawn - I go out with my dog so he can do his business. The "morning dew" on the lawn wasn't dew yesterday. It was slivers of ice. Got back in the house - my Davis weather station says it 27F - just at dawn. No wonder all the wildflowers are all hunched down this time of day.

 

[Tchamp]

That is a nice, clean looking upgrade. However - you talk about different operating conditions.

You down there in Georgia trying to keep thing cool. Up here in NE WA state - I'm still waiting for summer to kick in.

Yesterday - just at dawn - I go out with my dog so he can do his business. The "morning dew" on the lawn wasn't dew yesterday. It was slivers of ice. Got back in the house - my Davis weather station says it 27F - just at dawn. No wonder all the wildflowers are all hunched down this time of day.

Yeah i understand, alot different down here in Ga.

 

[m5040]

Anyone else have problems opening the pictures?

 

[2manyrocks]

Pictures open for me.

Tchamp, how did you cut the hole for the new cooler so neatly?

 

[ponytug]

Anyone else have problems opening the pictures?

The engine padding ones don't open for me, either.

 

[Tchamp]

Pictures open for me.

Tchamp, how did you cut the hole for the new cooler so neatly?

I used a 2 inch hole saw to cut through the metal from harbor freight