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Old 09-06-2017, 03:41 PM
PredatorPowaaa!! PredatorPowaaa!! is offline
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Default 208cc clone con rod

I have a pretty hopped up little 208cc clone from princess auto. Mods: gopowersports upgrade kit (jet, e-tube, air filter, and rlv pipe and muffler) removed governor internally, mod2 clone cam, 18lb valve springs, and 6 timing advance. I need to buy an upgraded con rod and flywheel. Can someone tell me which one to get? You know because there's tons of predator rods out there, but as I know, the 2 engines are somewhat different. Could I just use a predator arc billet flywheel?
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Old 09-06-2017, 03:48 PM
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I don't know jack about the 208cc. Call ARC, they might be open right now.
800-521-3560
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Old 09-06-2017, 06:41 PM
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It depends on a few things:
- whether the difference (208cc vs 212cc) is in the bore or the stroke
- are the journals the same size?

Unfortunately, comparing the difference means having both rods in your hands & physically measuring them so, taking Bobs advice is probably the best course of action...

If the only difference is the length of the rod, I don't see it being much more than 1mm so, not likely an issue, you would just end up with a mild stroker engine...
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Old 09-06-2017, 07:45 PM
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So, predator con rod it is?
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Old 09-06-2017, 09:11 PM
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What is the bore and stroke of your engine?
What size is the wrist pin that connects the rod to the Piston?

I'd call ARC.
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Old 09-06-2017, 09:12 PM
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Do us a favor.... For all us 208 fan boys.... Dissect, extract and measure the rod.... So we all know...
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Old 09-06-2017, 09:51 PM
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Quote:
Originally Posted by OzFab View Post
It depends on a few things:
- whether the difference (208cc vs 212cc) is in the bore or the stroke
- are the journals the same size?

Unfortunately, comparing the difference means having both rods in your hands & physically measuring them so, taking Bobs advice is probably the best course of action...

If the only difference is the length of the rod, I don't see it being much more than 1mm so, not likely an issue, you would just end up with a mild stroker engine...
The 208cc I found was a 70mm bore, same as Predator.
It has a 54mm stroke, 1mm less than the Predator.

Guessing everything is the same as on 196cc clones but the Piston (and cylinder bore), and probably the valves.

But it isn't the Rod that makes a Stroker. It is the crankshaft.

---------- Post added at 10:51 PM ---------- Previous post was at 10:42 PM ----------

If I had to guess, this is the Rod...
http://www.arcracing.com/6270-arc-ro...std-ohv-3-303/
but depending on how far your piston sits in the hole, you might want the 3.313" or the 3.323" Rod instead.
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Old 09-07-2017, 07:41 AM
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How would I measure "how far my piston sits in the hole"?
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Old 09-07-2017, 07:56 AM
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Quote:
Originally Posted by bob58o View Post

But it isn't the Rod that makes a Stroker. It is the crankshaft.
Combination of both usually. A stroker crank frequently uses a shorter rod so you don't bash the Piston into the cylinder head.
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Old 09-07-2017, 08:06 AM
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I suppose so, cuz if you get a longer conrod your piston goes up further, but doesn't go do un as far. With a stroker crank, your piston goes up farther but also goes down farther.
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Old 09-07-2017, 08:11 AM
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Quote:
Originally Posted by PredatorPowaaa!! View Post
I suppose so, cuz if you get a longer conrod your piston goes up further, but doesn't go do un as far. With a stroker crank, your piston goes up farther but also goes down farther.
Right, and a stroker crank combined with a shorter rod makes it go down even farther, but top dead center is still where it should be.
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Old 09-07-2017, 08:16 AM
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But, How would I measure "how far my piston sits in the hole"?
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Old 09-07-2017, 08:28 AM
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I take the head off, place a straight edge across the top of the block, roll the crank until the piston is at TDC, then use feeler gauges to determine the gap.
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Old 09-07-2017, 08:30 AM
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Alrighty.
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Old 09-07-2017, 02:49 PM
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Quote:
Originally Posted by bob58o View Post
I take the head off, place a straight edge across the top of the block, roll the crank until the piston is at TDC, then use feeler gauges to determine the gap.
Thats actually a really smart tip if you dont have a dial indicator. I am going to keep that in mind for future reference.
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Old 09-07-2017, 08:28 PM
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Quote:
Originally Posted by kevbo22 View Post
Thats actually a really smart tip if you dont have a dial indicator. I am going to keep that in mind for future reference.
I bought a dial indicator. I bought a magnetic base for it. I planned on using it for piston to valve clearances, because I find the Play-Doh method easy to mess up. I moved. I lost them both. No clue where the dial indicator or magnetic base is. Poof. Gone.

Sorry for the interruption. Please carry on.
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Old 09-07-2017, 10:02 PM
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Hard to get a magnet to stick to aluminum.
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Old 09-07-2017, 10:23 PM
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Quote:
Originally Posted by Whitetrashrocker View Post
Hard to get a magnet to stick to aluminum.
I guess I could have just called it a base. It also stands on its own.
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Old 09-07-2017, 10:48 PM
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Quote:
Originally Posted by bob58o View Post
But it isn't the Rod that makes a Stroker. It is the crankshaft.
Quote:
Originally Posted by anickode View Post
Combination of both usually. A stroker crank frequently uses a shorter rod so you don't bash the Piston into the cylinder head.
Technically, you're both correct (maybe one more so than the other ), which means I was incorrect (don't know what I was thinking ); perhaps what I should have said is "it may increase compression slightly... or, it may do nothing at all"...
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Old 09-08-2017, 06:20 AM
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?
What size is the wrist pin that connects the rod to the Piston?
...i have a year old con rod that has not been installed because my 196 cc clones wristpin was larger than the rods hole for the wristpin.
Take the advice measure and call ARC.
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