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Home > Help Needed / General Tech Chat > Timing Avonbar Phase 2 Cam

richminiturbo.

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Horndean - Near Portsmouth

9th Aug, 2008 at 02:55:34pm

Hi guys,

Going to have a crack at timing my cam today, ive not done if before this is my first build so have a few questions.

When I bought the cam "kit" back in 2006*surprised* it didnt come with a timing disc (which I have now) or any spec/instruction sheets! So im abit clueless about how it should be setup.

Ive read a good minispares article on how to time a cam using a DTI gauge and disc, also have the mini 1380 builder DVD for reference aswell.

Found some info about the cam on the Avonbar site:

"Avonbar Phase 2 Turbo cam

Our Phase 2 turbo cam is the product of 15 years worth of testing. On a good engine you will start creating boost at 1500rpm and when you hit 4000rpm you better be watching the road not the rev counter. Time this cam in at 108 degrees."

So.. i time the cam in at 108 degrees. From what ive read, this is 108 degrees BTDC on no.1 inlet lobe, am I correct? Is that all thats needed? What about chain stretch etc (im using a new vernier duplex kit), will I need to compensate for this with my initial setup?

Are there any other figures that I need to check/set especially for this cam? How have others set there phase 2 cam timing?

Cheers

Rich


Joe C

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Carlos Fandango

Burnham-on-Crouch, Essex

9th Aug, 2008 at 05:05:11pm

as you said really, just time it to 108 deg btdc, and make sure it is BTDC and not ATDC lol.

dunno what it says in the article you have used but, I always tak a reading 10 thou before full lift and 10 thou after and use this to calculate the timing as it eliminates any dwell over the nose. think I got that from the Big yellow Vizard book, oh and always rotate the engine the correct way!

some people like to time cams in a little advanced to allow for timing chain stretch, but most don't bother, it applys more to high reving N/A lumpa anyway really.


yes meant 10 befor and after *happy*

Edited by Joe C on 9th Aug, 2008.

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



El Potter

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Malta (Ex. Scotland)

9th Aug, 2008 at 05:07:09pm

You mean 10 thou before full lift and 10 thou after,right Joe?

Warning:Stig in Training


Vegard

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Chief ancient post excavator

Norway

9th Aug, 2008 at 07:57:51pm

Time it at 106.

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.

richminiturbo.

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Horndean - Near Portsmouth

9th Aug, 2008 at 10:56:14pm




On 9th Aug, 2008 Vegard said:
Time it at 106.


Ahh, just got in from timing it didnt see your post, was that 2 degrees to allow for chain stretch?

I've got it dialed in at 107.2 degrees to allow for a little stretch, think this will be ok?

Alot easier to do than I thought, don't see why people make such a fuss about doing it to be honest, I know its important to get right but as long as you understand what your'e doing it's fine?

How is it possible to time a cam 180 degrees out? By setting TDC with the cam sprocket 180 degrees to the crank sprocket?

Cheers


Vegard

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Chief ancient post excavator

Norway

9th Aug, 2008 at 10:58:01pm

It'll be OK. No, you cannot time a camshaft 180 degrees wrong. However, it depens if it's crankshaft or camshaft degrees *wink*

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.

richminiturbo.

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Horndean - Near Portsmouth

9th Aug, 2008 at 11:21:55pm

Ahh no worries then, im sure ive dont it right! Nice one!

Cheers for the help, I used the technique mini13 mentioned, piece o' cake!

Gonna build the gearbox tomorrow, bring it on!

Cheers

Rich


richminiturbo.

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Horndean - Near Portsmouth

10th Aug, 2008 at 09:41:29am




On 9th Aug, 2008 mini13 said:
as you said really, just time it to 108 deg btdc, and make sure it is BTDC and not ATDC lol.




Been thinking about this, you say make sure you time it BTDC.

Im confused, surely its always ATDC becuase, when you find TDC with the pulley dots lined up, the lobe only starts to lift after this point, when you rotate the engine anticlockwise from the flywheel, so thats ATDC?

Then you find the peak of this lift by noting the angle 10 thou before and after max valve lift and averaging it to find the (hopefully) angle you require for the cam?

Can anyone correct me because im confused and paranoid ive done it qrong now lol.

Cheers


robert

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uranus

10th Aug, 2008 at 10:30:51am

inlet is after tdc .

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

richminiturbo.

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Horndean - Near Portsmouth

10th Aug, 2008 at 10:51:51am

Yeah I know, thats why im confused. I've timed it on cylinder 1 inlet valve at 107.2 degrees.

How it is possible to time it "BTDC" when inlet is after TDC??


benjamin

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nsw austalia

10th Aug, 2008 at 11:26:26am




On 10th Aug, 2008 richminiturbo. said:
Yeah I know, thats why im confused. I've timed it on cylinder 1 inlet valve at 107.2 degrees.

How it is possible to time it "BTDC" when inlet is after TDC??


time it in turning engine backwards, sound stuped but iv done it lol

1152cc turboed mini clubman, most powerful 1.1L a-series?

http://boostmini.justboard.net/

richminiturbo.

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Horndean - Near Portsmouth

10th Aug, 2008 at 11:40:15am

Ahhhh ok i get it.

From the flywheel end ive been spinning it anti clockwise, think im ok then.

Just wanted to double check!
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