86B and valve hitting..??

andy198712 · Posted: Mon May 25, 2015 7:24 am Post subject: 86B and valve hitting..??

So i've got:

Stroker AA's 90.5
CB 82mm crank
1.1mm deck.
CB 044, not fly cut
40x35 valves
BP 1.4s which are 1:1.42 so not bad.

valve lift on the intake is 13.83mm or 0.5445in

Dots on the cams and crank gear are lined up, cam gear is on so the slot is alined with the bolt hole (IE the right way)

And i'm turning it over, and it jams, if i back off the valve adjuster a fair way it will turn over.

at first i thought it was rockers jamming on the head, but having just plasti the piston top i can see its the valve hitting the piston.

I wasn't expecting this with this cam and build?

Have i done something wrong here? maybe i need to measure exhaust lift to double check thats the same..?
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[email protected] · Posted: Mon May 25, 2015 7:42 am Post subject: Re: 86B and valve hitting..??

Bet the retainers are hitting the valve guides, or the springs are binding. Check these first.

If the pistons are contacting the valves it will be close to 5-10 ATDC. Spring and/or retainer problems will be around 80-100 ATDC.
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andy198712 · Posted: Mon May 25, 2015 8:08 am Post subject:

Hi John
That was on my list
But this little mark is from the valve

Image may have been reduced in size. Click image to view fullscreen.

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56vwoval · Posted: Mon May 25, 2015 8:29 am Post subject: valve hitting head

Clay the pistons. That will tell you the amount of valve relief you will need.
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andy198712 · Posted: Mon May 25, 2015 8:33 am Post subject: Re: valve hitting head

raul arrese · Posted: Mon May 25, 2015 8:38 am Post subject:

With that lift you shouldn't be hitting the piston , are you sure of all your specs ??
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Dan Ruddock · Posted: Mon May 25, 2015 8:42 am Post subject:

Degree the cam, something is out of time. You would have to flycut the heads a lot for that to happen with a 86b. I had no problem with a 86C. You have to check everything including what John said.

Dan

Dan Ruddock · Posted: Mon May 25, 2015 8:46 am Post subject:

mark tucker · Posted: Mon May 25, 2015 9:00 am Post subject:

thats exhaust so...your probably retarded. always degree befor checking squat.or...your just pissing in the rong side of the fan Shocked

like clearancing the case with rods not in correct position.

mcmscott · Posted: Mon May 25, 2015 9:04 am Post subject:

Put a .060 barrel shim in for mock up, then clay the piston and deduct the .060 to get your number. Or like a customer of mine was told " just retard the cam more". Which to me is a retarded way of fixing it.
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esde · Posted: Mon May 25, 2015 9:34 am Post subject:

Check the cam timing. I have the 86B with a tighter deck, and slightly higher ratio rockers, and no interference. Something isn't where it's supposed to be

Alstrup · Posted: Mon May 25, 2015 9:35 am Post subject:

[email protected] · Posted: Mon May 25, 2015 10:20 am Post subject: Re: 86B and valve hitting..??

did you degree the cam? It's probably advanced......
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Dan Ruddock · Posted: Mon May 25, 2015 10:23 am Post subject:

The quick and dirty way is the intake and exhaust should be open about the same amount @ TDC overlap, if there not something is wrong. Who knows cam grinder could of made a mistake or the crank keyway cut is wrong and other possibilities.

Dan

theastronaut · Posted: Mon May 25, 2015 10:28 am Post subject:

I just did this with my 1679cc with an 86b and 1.4's. The heads are flycut .180" and the deck is .038". As tight as everything is the intake only barely touches the piston- it'll cut the clay but the crank will still turn over no problem. The exhaust had around .055" clearance. Maybe your cam gear is off a tooth?

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mark tucker · Posted: Mon May 25, 2015 11:12 am Post subject:

MURZI · Posted: Mon May 25, 2015 11:52 am Post subject:

Before you do anything setup adjuster alignment at half lift and then recheck. Having a pushrod too long can cause you "that grief". It's a fine line.

This engine has 574 lift with 44 intakes. No notching.
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jfats808 · Posted: Mon May 25, 2015 11:55 am Post subject:

You sure the rockers aren't alien oversized to plus 1.48? Even so, you should still have room. Check the cam gear to see if you accidently put it 180. You can also turn the engine sideways and put a screwdriver in #2 exhaust lifter to see if you are on true #1 tdc compared to cam relation.
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Dale M. · Posted: Mon May 25, 2015 12:16 pm Post subject:

I think you have cam timing issue.... Is gear really on cam in correct position...

Dale
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Dan Ruddock · Posted: Mon May 25, 2015 1:12 pm Post subject:


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