New to r/c with engine question - RCCanada - Canada Radio Controlled Hobby Forum
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Old 04-28-2009, 06:21 PM   #1
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New to r/c with engine question

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Hey y'all, I am new to the r/c thing and having some bad luck. The 1st two used vehicles I purchased were garbage, and I was told they worked great. Now heres my question, I did but a brand new OFNA ultra LX1 which is amazing. I would like to purchase a used engine to put on an HPI MT2, its one of the cars I bought used, and my local hobby shop told me just the engine was gone. I just want to fart around with it, nothing serious which is why I want to go used. How can I tell if an engine works without hooking it up when someone approaches me with a used one??? Can someone help me out.
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Old 04-28-2009, 06:37 PM   #2
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There is a list of things that could potentially be good OR bad about an engine, but the biggest concern you should have, is whether there is enough compression!

Here's a popular method of assuring the compression is ok. It's widely used, and should give you a good feel of the engines 'tightness'...

With the engine out of the buggy, and the pipe installed, hold the flywheel with one hand, and the head of the engine with the other. Now...release the head and ONLY hold it by the flywheel. The weight of the pipe will make the engine want to rotate to that side. Now here's the test... IF there is good compression, the engine should not rotate around, and be 'tight' enough to sustain the weight of the pipe. If it does hold, your probably good to go. If it immediately plops over with little, or no's POOCHED!!!

Sure there are more ways than this, but this method is probably used most regularly.

Good luck with the engine purchase bud. There are MANY guys on this sight that you could count on, for buying good used stuff!!!

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Old 04-28-2009, 06:37 PM   #3
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engine life

well it is always a risk buying a used engine, but a good guide is to wiggle the crankshaft and see if there is excessive play within the internal parts\bearings, then spin the crankshaft or twist it to check and see if the piston and sleeve is still tight, it should get pretty hard to turn over at the top of the stroke( you can look in the port threw the crankcase to see the piston moving up and down.)
a good engine for the MT 2 is an O.S. .18, or maybe even a .15, upgrade the spurr grear to the metal gear with the slipper clutch though if you dont want to keep blowing spurr gears, especially if you are jumping a lot.
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Old 04-29-2009, 06:17 AM   #4
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Thanks guys

I hope I can get help here for sure. I will be needing it soon. Actually I want to tune my new OFNA buggy but really sure how. If anyone lives near Barrie and wants to meet up for some beers this week-end, let me know. You can just send an e-mail to
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