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Offline Adam_#757

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Intek 40ci
« on: January 11, 2016, 05:23:21 am »
Hi
I built up a intek 40ci race engine it runs awesome until it pulled the rocker arm mount out of the head , whats the best way to prevent this happening again ??
Thanks Adam 
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Offline Dman

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Re: Intek 40ci
« Reply #1 on: January 11, 2016, 10:01:00 am »
Heli-coil?
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Offline Adam_#757

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Re: Intek 40ci
« Reply #2 on: January 11, 2016, 12:09:02 pm »
I tryed that and it ripped the whole mount out of the head.
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Offline PJG56

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Re: Intek 40ci
« Reply #3 on: January 11, 2016, 12:12:33 pm »
what are you running for valve spings
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Paul Guptill  (oppy) #238modX
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Offline chavez

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Re: Intek 40ci
« Reply #4 on: January 11, 2016, 01:15:18 pm »
Make sure you don't get coil bind on your valve springs, can happen just adding a so called Rev kit. Also if running a valve stem seal, make sure the retainer doesn't bind on that either, really don't need one anyway.   No need to run more valve spring pressure than necessary, as it's only robbing power if it isn't needed to control the valvetrain.
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Offline PJG56

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Re: Intek 40ci
« Reply #5 on: January 11, 2016, 01:22:29 pm »
Quote from: Add575 on January 11, 2016, 05:23:21 am
Hi
I built up a intek 40ci race engine it runs awesome until it pulled the rocker arm mount out of the head , whats the best way to prevent this happening again

What are are running for cam, what is rocker ratio,what are valve springs,is this exhaust or intake valve this happened to etc.etc.
You need to give more info to get an answer...
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Paul Guptill  (oppy) #238modX
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Offline Adam_#757

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Re: Intek 40ci
« Reply #6 on: January 11, 2016, 02:14:04 pm »
Cheetah cam, ec roller rockers 1.5 ratio, ec dual valve springs, running no valve steam seals and have had the guides machined down , It happened to the exhaust valve side.
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Offline PJG56

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Re: Intek 40ci
« Reply #7 on: January 12, 2016, 08:43:07 am »
Sounds like exhaust reatainer is kissing top of guide when warmed up .Try just the stock rocker on the exhaust and see what happens I'll bet your problem will go away
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Paul Guptill  (oppy) #238modX
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Offline Adam_#757

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Re: Intek 40ci
« Reply #8 on: January 12, 2016, 12:29:29 pm »
Could it be too high valve spring pressure??
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Offline cycloneracer

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Re: Intek 40ci
« Reply #9 on: January 12, 2016, 12:58:23 pm »
Quote from: Add575 on January 12, 2016, 12:29:29 pm
Could it be too high valve spring pressure??

I ran my intek for a long time with EC dual springs and the same cam as you.   Never had a issue with either the stock rockers or rollers.   

I'd double check the clearance on the retainer to the guide.  Also check the clearance on the spring at full lift as well.

Or you just got a bad head.  Remember these are made by Briggs and Stratton for lawn mowing use...........
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Offline Adam_#757

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Re: Intek 40ci
« Reply #10 on: January 12, 2016, 05:56:37 pm »
Thanks , i had them machined but i will reassemble and check.
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Offline Big Mike

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Re: Intek 40ci
« Reply #11 on: January 12, 2016, 09:41:54 pm »
install 1/4" steel underneath the cyl head & run long bolt through tree & secure with nut it will end that problem.
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Offline Adam_#757

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Re: Intek 40ci
« Reply #12 on: January 12, 2016, 10:07:42 pm »
Awesome, Thanks For your Help.
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Offline Adam_#757

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Re: Intek 40ci
« Reply #13 on: January 13, 2016, 09:40:07 pm »
Where's  the best place to order stainless valves from ??
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