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Forum: Glow Engines

09-10-2004, 10:20 PM

Replies: 11

27cc motor spits,sputters, and cuts off on the top end??

Views: 798

Posted By William Robison

RE: 27cc motor spits,sputters, and cuts off on the top end??

Mike:

If it's a 27cc engine with a combustion chamber volume of 3cc that's 10:1 CR, geometric. the 27cc cylinder volume added to the 3cc combustion chamber gives a total of 30cc with the piston...

Forum: Glow Engines

09-10-2004, 08:12 PM

Replies: 11

27cc motor spits,sputters, and cuts off on the top end??

Views: 798

Posted By William Robison

RE: 27cc motor spits,sputters, and cuts off on the top end??

Mike:

You may have an engine that's been converted to junk. If the cylinder has more wear in those four places than elsewhere the ring will not be able to seal in the worn places, it will not...

Forum: Glow Engines

09-06-2004, 05:08 PM

Replies: 11

27cc motor spits,sputters, and cuts off on the top end??

Views: 798

Posted By William Robison

RE: 27cc motor spits,sputters, and cuts off on the top end??

Mike:

On the racing cars we could only go to 11:1 CR with gasoline, and that had to run ocftane of 105 or better. On alcohol 14.5:1 seemed best. These are both normally aspirated of course, with...

Forum: Glow Engines

09-06-2004, 03:33 PM

Replies: 11

27cc motor spits,sputters, and cuts off on the top end??

Views: 798

Posted By William Robison

RE: 27cc motor spits,sputters, and cuts off on the top end??

Mike:

Spark ignition puts it in a different ball park. And it could well be just a bad plug.

If the rise time of the spark voltage is a little slow, the "Spark" can leak off over a slightly...

Forum: Glow Engines

09-06-2004, 01:43 AM

Replies: 11

27cc motor spits,sputters, and cuts off on the top end??

Views: 798

Posted By William Robison

RE: 27cc motor spits,sputters, and cuts off on the top end??

Mike:

Running alcohol fuel with glow ignition, your description makes me think your high speed adjustment is way too lean.

Run the throttle up as far as it will go and keep running, while...

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