engine help

[supercharged]

what do people know about this engine

all i know nade by irvine size .21

 

[.21Rc10GT]

Do you have one, or are you looking to buy one? I don't know anything about them... i have never heard of them.

 

[supercharged]

i'm making a rc car at college for a competition Formula schools

we have to use that engine
i want to know if you can remove shims

 

[.21Rc10GT]

What kind of fuel are you going to be running?

 

[AC48]

I don't know anything about that engine, but what you can do is remove the shims and see if anything hits. If not you're good to go! lol

 

[supercharged]

probably tornado or blue thunder 20-30%

prob take a shim or 2 out

 

[.21Rc10GT]

How many shims does it have?

 

[niggle]

i'm making a rc car at college for a competition Formula schools

we have to use that engine
i want to know if you can remove shims

Do yourself a favour and look at the rules page on the formula schools site.

The engine is an Irvine 20. Irvine are normally associated with aero engines and looking at the heatsink and crank shaft I would suggest that this is in fact an aero engine, which is not ideal for car use.

The rules say the engine may be modified but must be "identifiably the same". I guess this rules out changing the heatsink for a larger one, so make sure that the body design allows plenty of airflow around the heatsink. This does not rule out porting and polishing the engine internally. Leave this work to someone with experience, but consider adding teardrop grooves to the schneurle ports and cutting away the skirt at the front of the piston so that it doesn't mask the boost port at BDC. Make sure that the ports in the sleeve match the ports in the crankcase, but only grind the outside of the sleeve. Do not grind to the chrome plated inside of the the sleeve as the plating may start to flake off. Polish afterwards to remove any burrs left by grinding.

Fuel is also unrestricted according to the rules, so rather than removing shims to increase compression use a fuel with higher nitro content. Try 25% nitro to start with. I would recommend a colder plug for higher nitro fuel, a NovaRossi #6 or C6S would be a good place to start.

 

[supercharged]

thanks for the advice