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Depends on the cam...
for a stock Mini cam and 1.5s, .015-.016".

with a Kent 266-276-286 etc, or a Graham Russell RE13, .016" is right for stock rockers, but for 1.5s- .018-.020" is recommended. :wink:

I use 1.5 rockers with an RE282, I run (the GR recommended) inlets .022" exhausts .024".

<edit> rule of thumb is, (stock rocker clearance + .003").

My Cooper S has these roller rockers fitted (see pic), I assume they are 1.5's.

Without knowing what type of cam is fitted is the role of thumb mentioned the best setting.

They seem to be set at around .020 at the moment.

this is different from a small bore or is it the same?

The reason they are wider is as I stated. You want the same lifter to lobe clearance after the rockers are changed.
Yes the rule of thumb is .003" increase, but the formula for 1.5 rockers is :
new rocker clearance = (rocker clearance spec for the cam) x 1.5/1.25

For a .016" gap (Kent cam) it comes in at .0192".
So, .003" increase is pretty damn close.

drmini in aust wrote:

yeah sorry doc, I wasn't saying you were wrong mate, I was telling you what they say

you were right anyway

PK I was actually replying to phillb, in a simplified fashion.
I am a man of few words... :mrgreen:

std cover fits no worries

I'm a bit odd,,,, I actually like the standard covers :shock:

So I have them on all my motors.

Also I have noticed the oil filler cap of the alloy one has been rubbing on the bracing of the underside of the bonnet.

Author:	KittyKat [ Sun Jun 11, 2006 5:03 pm ]
Post subject:	Rocker gap?
What is the proper rocker gap for my 1275 with 1.5 roller rockers? thanks

Author:	drmini in aust [ Sun Jun 11, 2006 5:14 pm ]
Post subject:
Depends on the cam... for a stock Mini cam and 1.5s, .015-.016". with a Kent 266-276-286 etc, or a Graham Russell RE13, .016" is right for stock rockers, but for 1.5s- .018-.020" is recommended. I use 1.5 rockers with an RE282, I run (the GR recommended) inlets .022" exhausts .024". <edit> rule of thumb is, (stock rocker clearance + .003").

Author:	phillb [ Tue Jan 05, 2010 10:36 pm ]
Post subject:
drmini in aust wrote: Depends on the cam... for a stock Mini cam and 1.5s, .015-.016". with a Kent 266-276-286 etc, or a Graham Russell RE13, .016" is right for stock rockers, but for 1.5s- .018-.020" is recommended. I use 1.5 rockers with an RE282, I run (the GR recommended) inlets .022" exhausts .024". <edit> rule of thumb is, (stock rocker clearance + .003"). My Cooper S has these roller rockers fitted (see pic), I assume they are 1.5's. Without knowing what type of cam is fitted is the role of thumb mentioned the best setting. They seem to be set at around .020 at the moment.

Author:	Phat Kat [ Tue Jan 05, 2010 11:00 pm ]
Post subject:
Quote: My Cooper S has these roller rockers fitted (see pic), I assume they are 1.5's. Without knowing what type of cam is fitted is the role of thumb mentioned the best setting. They seem to be set at around .020 at the moment. Yep, those look like the miniSPARES 1.5 rockers. Kent state that for ANY of thier cams being used with 1.5's that the clearance should be 0.019"... hope that helps Doc... GR was saying the other day, that it depends on the profile of the cam and the ramp up (how quickly it opens) ... and I'm not arguing with that, he is right... but it is safe to say that with higher lift lobes, considering that the lobe only has (for example) 290 degrees to go from 0.000" to 0.340" (at the lobe) and then back to 0.000" agian,,, its pretty safe to say that it will have a pretty quick opening rate and extra clearance should be made. Most manufactures of high lift rockers recomend 0.018,, but if your lobe lift is higher than say 0.260" to 260 degrees duration I don't think it would hurt giving it an extra 0.001-0.002"... it won't kill your motor giving it extra clearance,, but it will kill it if it doesn't have enough.... if there is toooo much clearance, obviously you are going to rob yourself of some of the potential lift... EDIT--> thats better, quote fixed

Author:	miniDave [ Wed Jan 06, 2010 7:45 am ]
Post subject:
Might have to go back and re-adjust. Must admit didn't even look at the book - just set what I do on the Chev V8 engine ( 0.008 inlet and 0.010 exhaust) BTW - Standard rockers, 266 cam, double valve springs.

ausmini https://www.ausmini.com/forums/

Rocker gap? https://www.ausmini.com/forums/viewtopic.php?f=2&t=20067	Page 1 of 2

Author:	carter [ Wed Jan 06, 2010 9:22 am ]
Post subject:
this is different from a small bore or is it the same?

Author:	Phat Kat [ Wed Jan 06, 2010 9:30 am ]
Post subject:
carter wrote: this is different from a small bore or is it the same? Exackery da same. Small and big bore, it doesn't matter. miniDave, wow, how long have they been like that for?

Author:	drmini in aust [ Wed Jan 06, 2010 6:37 pm ]
Post subject:
The reason they are wider is as I stated. You want the same lifter to lobe clearance after the rockers are changed. Yes the rule of thumb is .003" increase, but the formula for 1.5 rockers is : new rocker clearance = (rocker clearance spec for the cam) x 1.5/1.25 For a .016" gap (Kent cam) it comes in at .0192". So, .003" increase is pretty damn close.

Author:	Phat Kat [ Wed Jan 06, 2010 6:47 pm ]
Post subject:
drmini in aust wrote: The reason they are wider is as I stated. You want the same lifter to lobe clearance after the rockers are changed. Yes the rule of thumb is .003" increase, but the formula for 1.5 rockers is : new rocker clearance = (rocker clearance spec for the cam) x 1.5/1.25 For a .016" gap (Kent cam) it comes in at .0192". So, .003" increase is pretty damn close. yeah sorry doc, I wasn't saying you were wrong mate, I was telling you what they say you were right anyway

Author:	drmini in aust [ Wed Jan 06, 2010 7:22 pm ]
Post subject:
Phat Kat wrote: drmini in aust wrote: The reason they are wider is as I stated. You want the same lifter to lobe clearance after the rockers are changed. Yes the rule of thumb is .003" increase, but the formula for 1.5 rockers is : new rocker clearance = (rocker clearance spec for the cam) x 1.5/1.25 For a .016" gap (Kent cam) it comes in at .0192". So, .003" increase is pretty damn close. yeah sorry doc, I wasn't saying you were wrong mate, I was telling you what they say you were right anyway PK I was actually replying to phillb, in a simplified fashion. I am a man of few words...

Author:	Phat Kat [ Wed Jan 06, 2010 8:17 pm ]
Post subject:
drmini in aust wrote: PK I was actually replying to phillb, in a simplified fashion. I am a man of few words... Yeah, I'm still learning how to do that

Author:	phillb [ Thu Jan 07, 2010 9:30 am ]
Post subject:
Thanks to both PK and DrMini for the answers and explanation. The other thing I was wondering is would a standard original rocker cover fit over these rockers. An alloy cover is fitted at the moment, the style that has the slope from rear to front (of the car) in the top.

Author:	Phat Kat [ Thu Jan 07, 2010 3:07 pm ]
Post subject:
std cover fits no worries I'm a bit odd,,,, I actually like the standard covers So I have them on all my motors.

Author:	phillb [ Thu Jan 07, 2010 3:32 pm ]
Post subject:
Phat Kat wrote: std cover fits no worries I'm a bit odd,,,, I actually like the standard covers So I have them on all my motors. I'm the same, I like the original. I love the hot run tested sticker too. Also I have noticed the oil filler cap of the alloy one has been rubbing on the bracing of the underside of the bonnet.

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Author:	Phat Kat [ Thu Jan 07, 2010 3:39 pm ]
Post subject:
phillb wrote: Also I have noticed the oil filler cap of the alloy one has been rubbing on the bracing of the underside of the bonnet. how curious? Yeah, I prefer the originals for a few reasons,,, they're sneaky (you don't suspect a thing ),,, they usually seal properly (alot of the current alloy ones don't and leak oil),,, I find them astheticlly appealing (they don't look like something you'd cook a sandwich on).... But lots of people like them, they're "meant" to be quiter (less tappet noise). I say good for them... more stockers for me