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View Full Version : Small Tecumseh Compression Mod

GoAlterBridge
07-16-2008, 06:50 PM
I'm sure some of you have done or at least heard of this, but I've made this thread anyway.
I recently took the gasket of my Tecumseh, and replaced it with some gasket maker. You can buy it at any auto parts store, including Napa, for just a few bucks. I then bolted the head plate back on. I let it cure for 24 hours, and when I started it up, I noticed it had a much larger amount of power. I could tell just from pulling the starter cord, it had tons more compression than before. It even sounds different. It has a kind of a deeper, more satisfying sound then it ever had.
jr dragster Tyler
07-16-2008, 07:13 PM
I have 2 identical MAC trimmers. I did the mod to one, and it ran MUCH better. Did the mod to the other one and I had TONS of detonation.
Russ2251
07-16-2008, 07:23 PM
Have done some recent work on this. Check Lawn-Boy threads.
2or3wheels
07-16-2008, 08:21 PM
well i think i should get my tecumsech out of the back of the g-rage and rebuild it.
oscaryu1
07-16-2008, 08:25 PM
I have 2 identical MAC trimmers. I did the mod to one, and it ran MUCH better. Did the mod to the other one and I had TONS of detonation.

Did you try higher octane fuel in the detonating one?
Russ2251
07-16-2008, 08:50 PM
...or mothballs?
jr dragster Tyler
07-16-2008, 08:51 PM
Nope just replaced head gasket and ran great. Its just a engine for playing around with.
ed1380
07-16-2008, 08:53 PM
higher octane resists detonation better. you could have run it on higher octane
jr dragster Tyler
07-16-2008, 10:19 PM
I know. The engine is JUSTfor playing around with. Not 100% performance. I just like to fire it up every so often.
Kenny_McCormic
07-16-2008, 10:53 PM
I have 2 identical MAC trimmers. I did the mod to one, and it ran MUCH better. Did the mod to the other one and I had TONS of detonation.

AVgas fixes that.
jr dragster Tyler
07-16-2008, 11:06 PM
haha Whats the octane of that? I could run Alky if I wanted to flush it out every start up (130 octane)
Kenny_McCormic
07-16-2008, 11:09 PM
haha Whats the octane of that? I could run Alky if I wanted to flush it out every start up (130 octane)

Most common is 100LL (low lead 100 octane), buy it at any airport. Almost $6 a gallon.
ed1380
07-17-2008, 06:23 AM
I know. The engine is JUSTfor playing around with. Not 100% performance. I just like to fire it up every so often.

i had one like that. 36cc chainsaw. now it doesnt want to work :(