Author Topic: 1100cc head valve clearances.  (Read 359 times)

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Storm

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1100cc head valve clearances.
« on: October 07, 2018, 11:10:49 AM »
I have put a 1100cc head on a 998cc block. I have torqued the head down to 40lbft as recommended. I have done this to get an unleaded head and a bit more grunt. I would like to know what the clearance should be on the valves. First setting and when hot.
« Last Edit: October 07, 2018, 11:42:42 AM by Storm »

Terry

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Re: 1100cc head valve clearances.
« Reply #1 on: October 07, 2018, 11:52:56 AM »
Hi,

.012"-.015" thou is the normal settings used.

If you have a workshop book the clearances are normally listed in there.

Terry
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Storm

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Re: 1100cc head valve clearances.
« Reply #2 on: October 07, 2018, 12:32:25 PM »
Thanks Terry. The manual said 0.015" to 0.025" so I was a bit confused.

Halfpint

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Re: 1100cc head valve clearances.
« Reply #3 on: October 07, 2018, 12:48:32 PM »
Is that what they say for hot?
Generally it’s .012” cold.
HP
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Terry

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Re: 1100cc head valve clearances.
« Reply #4 on: October 07, 2018, 01:56:57 PM »
Is that what they say for hot?
Generally it’s .012” cold.
HP

My numbers are for when setting cold.

From something I was reading not too long ago suggested that you should use a dial indicator and set each clearance according to the movement on the gauge to make sure you get an even opening sequence and thus a few more ponies. I haven't bothered to try that method though.

Terry
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Re: 1100cc head valve clearances.
« Reply #5 on: October 07, 2018, 08:34:37 PM »
Oh no Terry, .012” to .015” is all I’ve ever seen, (except for 1.5:1 rockers).
I’ve not seen .015” to .025” tappet clearances before in any of the workshop manuals I’ve ever used.
Hmmmm, dialing in individual tapets, nah! I’ll let that 1 or 2 ponies escape into the paddocks  ;)
HP
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Storm

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Re: 1100cc head valve clearances.
« Reply #6 on: October 14, 2018, 04:56:45 PM »
Sorry about this but I read the manual wrong and I looked at Valve stem to guide clearance  ( 0.015" - 0.025" ) not Valve rocker clearance ( 0.012" ). Thanks and sorry for the confusion but that was why I asked as it was a big difference of 0.010"
« Last Edit: October 14, 2018, 05:02:20 PM by Storm »