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Author Topic: 30 ci Vanguard ( 16 HP )  (Read 697 times)
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DieselPacko
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« on: January 28, 2014, 11:42:20 AM »

 Hello guys . Sweden again....

 I put my new engine together with the parts from EC.
 ARC rods, EC Cam, ARC flywheel.
 I shaved the pistons as in the recomendation.
 The engine is running great with a lot of power .
 
 But when I spoke to a friend of mine whos working with racing bikes, he told me that probably I will destroy my pistons very quickly
 because its to thin at the top of the piston.
 He said the top piston ring will not stay in place for to long, though it's only approximately 2.5mm left and that is not enough to keep the top ring in place .

 Does anywone use the long rods for this engine and did the same thing ?

 
 Did you have any problems with your engines ?

 Please let me know, I don't want to destroy my brand new engine, with all this nice parts in it.
 
 I hope you understand my description . If you take a look at the attached picture, the part is marked with red, that's the part I am worried about. That part is only 0.079"
 Isn't that to thin ?


* 843951-1.jpg (35.3 KB, 328x183 - viewed 38 times.)
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Jim Knutson
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« Reply #1 on: January 28, 2014, 02:59:19 PM »

if the distance from the top of the top ring groove in the piston, to the top of the piston, is equal too, or greater than the width of the ring groove in the piston, then you should be fine. if it is less than the ring groove width in the piston, you are looking for a problem. this is as long as you are running zero deck height or less. if running any pop- out, then there are other factors to consider, and taking the top ring off completely may need to be done to prevent the ring from catching the top of the cylinder, and ripping the top of the piston off.
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Jim Knutson
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DieselPacko
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« Reply #2 on: January 28, 2014, 03:20:37 PM »

Ok, thanks.
Shouldn't this problem be checked by ARC?
I mean.... they do recommend that your must shave the piston to make it work with the 4.262 rods.

I can't meassure it now because the engine is assambled and tested. For the moment it works fine but I have only run it in my garage. (never on a track or under load)
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heymow.com - Lawn Mower Racing Forum
« Reply #2 on: January 28, 2014, 03:20:37 PM »

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Old Goat
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« Reply #3 on: January 28, 2014, 07:14:42 PM »

Read this. Basically it's saying what Mr. Knutson just said.  bigsmile  http://www.heymow.com/index.php?topic=28096.0
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Jim Klauss
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DieselPacko
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« Reply #4 on: February 12, 2014, 03:21:43 PM »

OK. I understand . But still. Can i run this "black" vanny with this mods. The engine is manufactured 2012 November.
What i read here, on this forum , that is a big difference in quality between the red old vannys and the black new vannys. The black ones are not as god as the red ones... ?
I noticed the difference between the pistons , and the rings , and this matter is just about that.
Mr. George mentions this in another thread I read.
I bought this engine as brand new, and they are extremely expensive in Sweden. The Swedish price in USD will be 2292 $.
And the parts from EC like the rods, flywheel, camshaft, shipment + 25% tax on the total price to the Swedish government on all my orders from the US.
So I hope you guys will understand my concern. Sad 
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