Author Topic: Cylinder machining vanguard  (Read 888 times)

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Offline mod 76

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Re: Cylinder machining vanguard
« Reply #15 on: August 01, 2018, 06:58:56 AM »
Oh , okay . I thought I'd have to do the block . I can do the head then . Is it any type of special wire ? A hoop ? Or just a length of it cut to fit ..

Offline rotten ron

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Re: Cylinder machining vanguard
« Reply #16 on: August 01, 2018, 02:39:46 PM »
We used stainless wire and cut to  length ,we did try copper and it worked too

Offline mod 76

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Re: Cylinder machining vanguard
« Reply #17 on: August 02, 2018, 09:13:01 PM »
Okay , thanks .. I'll be trying to cut Owings on a salir set of heads this weekend ..


Offline rotten ron

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Re: Cylinder machining vanguard
« Reply #18 on: August 03, 2018, 08:37:55 PM »
I wouldn't be afraid to use the old pistons give them .002 to .0025 , I have done it lots of times,why did he say not to use them?

Offline rotten ron

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Re: Cylinder machining vanguard
« Reply #19 on: August 03, 2018, 08:49:09 PM »
Back when 352 and 390 fords were popular,if you had a 390 and the pistons were still good and the cylinders needed to be bored i would get a 352 block and bore it .050 and fit the use pistons to it. It was like having a standard bore 390 block but with no wear.

Offline mod 76

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Re: Cylinder machining vanguard
« Reply #20 on: August 05, 2018, 09:48:37 PM »
He just said that the pistons distort over time/use and he wouldn't be able to achieve symmetrical cylinder wall clearance of .003/4.. basically,  the skirts are shaped like an egg compared to the top ......

He builds high end  kart engines so I just said okay , but it did set the whole project back now ... idk... I've always reused pistons in the past ...

Offline mod 76

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Re: Cylinder machining vanguard
« Reply #21 on: September 15, 2018, 09:32:36 AM »
Okay , the block has been bored and thr new pistons installed . I do notice that the piston is not flush with the deck . It sits about 0.113" / 2.87mm down in the bore . The rods are arc #6275 . Not sure if thats too much , all the rotating assembly's  clear internally with no issues. 

I thought this combo would give me just about a zero deck height.. ???


Offline mod 76

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Re: Cylinder machining vanguard
« Reply #22 on: September 15, 2018, 09:33:59 AM »
Also , what is the torque on the arp rod bolts ??

Offline PJG56

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Re: Cylinder machining vanguard
« Reply #23 on: September 15, 2018, 06:41:39 PM »
Rod bolt torque is 170 in/lbs lubricated.
At .113 in the hole with the piston,is going to be numb at best you've just added aprox 13cc to combustion area.
The 6276 ARC rod is .128 longer than the one you have,maybe should have used them and cut top o piston
Paul Guptill  (oppy) #238modX
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Offline rotten ron

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Re: Cylinder machining vanguard
« Reply #24 on: September 15, 2018, 08:02:57 PM »
The piston is down way too far to have much compression,like he said go with  the longer rod,13 ccs is almost half the ccs of a stock combustion chamber .

Offline mod 76

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Re: Cylinder machining vanguard
« Reply #25 on: September 16, 2018, 03:09:25 AM »
Ya , i figured it out .. i never thought to check the rod length.  I assumed they were right ... thats what i get .. ill be ordering the correct pistons later on ....

Offline PJG56

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Re: Cylinder machining vanguard
« Reply #26 on: September 16, 2018, 04:12:47 PM »
Just out of curiosty,what is the compression height on the pistons you have??
Stock 40ci Intek pistons compression height is .983
Paul Guptill  (oppy) #238modX
2012 slmra mowstock champion(builder/owner)

2013 slmra mowdified champion(builder/owner)
2013 ARMA national champion Mod-X(builder/owner)
2014 ARMA national champion Mod-X(builder/owner)
2014 All American Champion Mod-X/CP(builder/owner)
2014All American Champion FXT (engine builder)
2014 All American 2nd place SP(builder/owner)
2015 All American 2nd place BP (builder/owner)
2016 OutlawTriple Crown FXT Champion (engine builder)