Can I increase my compression?

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Mrdavis72

RCNT Member
Messages
29
Location
Edmonton,AlbertA
I was told at hobby shop that my compression is a little low. Is there a way to restore it or increase it without buying a new motor? The flywheel still has lots of resistance when I turn it with my fingers. Do I just replace piston and sleeve. Still runs fine just wondering.
 

tvjv2009

The dork that asks all the stupid questions...
Messages
360
Location
SOUTHERN OHIO
RC Driving Style
Bashing
If it still runs good, I would run it. Those engines were kinda known for splitting rod journals long before they wear out. There are beefy rods out thrre, so WHEN you rebuild, get a good rod and new sleeve/pis. You will have more in a rebuild but you will be better off imo.
 

hotrodrob

not hotdogbob
Messages
2,446
Location
s.o.s
RC Driving Style
Bashing
Picco max .21 is a good one...anything more than that and your gunna need some serious upgrades!..even the .21s will eat up Trans gears and and also diffs if there not shimmed
 

WinnersCircle

RCNT Racer
Military Veteran
Messages
111
Location
Snellville, Ga - Atlanta
RC Driving Style
Racing
An engine with low compression will usually have problems running at lower RPMs and may not idle. If you like the engine you can restore the piston to sleeve fit and have compression of a new engine by having the piston/sleeve squeezed. I have done this a number of times and it always restores the pinch to the engine and makes it run like new. It usually cost $10 t0 $20 to have this done and it is worth the $$$.

To have this done, check with Murnan Modified or do a search of RCtech for RayA (Ray Aronica). Both of these guys do a great job.

Lee
I was told at hobby shop that my compression is a little low. Is there a way to restore it or increase it without buying a new motor? The flywheel still has lots of resistance when I turn it with my fingers. Do I just replace piston and sleeve. Still runs fine just wondering.
 

wacmartin

DAMN TREES
Messages
1,216
Location
Ontario Canada
RC Driving Style
Bashing
When asking for help you need to disclose all information. What I'm talking about is the super charger you have on your engine. I guarantee you that is the culprit to your low compression problem, they cause the motor to run to lean.
 

Greywolf74

I'M TO BLAME!
Messages
6,329
Location
Ohio
RC Driving Style
Bashing
Yup, dump the stupid charger, replace the piston and sleeve and then you'll be right as rain.
 

Martinb

RC Newbie
Messages
1
If it still runs good, I would run it. Those engines were kinda known for splitting rod journals long before they wear out. There are beefy rods out thrre, so WHEN you rebuild, get a good rod and new sleeve/pis. You will have more in a rebuild but you will be better off imo.
Just pinch your sleeve
 

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