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Gtir Motorsport club

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little advice needed

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johnny gtir
Gostek
PartyPete
Stu
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1little advice needed Empty little advice needed 21st April 2017, 6:34 pm

Stu

Stu
Admin
Admin

If the timing is out by one tooth or so would that make the car iddle as if it had bigger cams in it?
My mates gtir had hks 264 cams and that was lumpy.

My car on iddle isnt as much like that.
But it does drop revs as if it has bigger cams installed.

What other symptoms if any would be happening if it was out by a tooth?


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2little advice needed Empty Re: little advice needed 21st April 2017, 6:37 pm

Stu

Stu
Admin
Admin

I was at my mates unit just sorting an exhaust leak the other week and when I had the car on iddle he asked if it was cammed up.


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3little advice needed Empty Re: little advice needed 21st April 2017, 7:48 pm

PartyPete

PartyPete
the one star club
the one star club

I rebuilt my Evo and got the timing out by one tooth and it ran lumpy as though it was crammed up, so yes I'd say

4little advice needed Empty Re: little advice needed 21st April 2017, 7:56 pm

Stu

Stu
Admin
Admin

It drives okay until I come off throttle and then it jerks like a miss fire. But obviously off throttle so isnt a miss fire.
And as I say on tick over the revs drop but like a miss fire.
Its hard to explain.
Will try and get a vid up tomorrow.


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5little advice needed Empty Re: little advice needed 21st April 2017, 8:02 pm

Gostek

Gostek
Events Organiser
Events Organiser

Air leaks are in the fashion nowadays.... Wold make it lumpy on tick over. If you'd have timing out by tooth there is be a chance that it would lock up.


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6little advice needed Empty Re: little advice needed 21st April 2017, 8:14 pm

johnny gtir

johnny gtir
moderator
moderator

where roughly is your dizzy set mate ? I.e. How Much of the  hole  can you see either side of the bolt

7little advice needed Empty Re: little advice needed 21st April 2017, 8:33 pm

Stu

Stu
Admin
Admin

Gostek wrote:Air leaks are in the fashion nowadays.... Wold make it lumpy on tick over. If you'd have timing out by tooth there is be a chance that it would lock up.
I need to do a vacuum leak test.

johnny gtir wrote:where roughly is your dizzy set mate ? I.e. How Much of the  hole  can you see either side of the bolt
little advice needed 20170421_213130_zps350xqqmq


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8little advice needed Empty Re: little advice needed 21st April 2017, 8:35 pm

johnny gtir

johnny gtir
moderator
moderator

On that pic I would say it's not out

9little advice needed Empty Re: little advice needed 21st April 2017, 8:37 pm

Stu

Stu
Admin
Admin

johnny gtir wrote:On that pic I would say it's not out
Okay thanks.
It was just a thought that jumped into my head.
I was sure we timed it up right when we rebuilt the engine.

I just can't seam to figure out what's wrong with it.
Its not a major pain.
Just one of those niggles.


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10little advice needed Empty Re: little advice needed 21st April 2017, 9:58 pm

shroom

shroom
moderator
moderator

Yeah mine runs lumpy on idle didn't have a lamda fitted so fitted that still seems lumpy I do have HKS 264 cams but think it may be an air leak somewhere but haven't been able to find out were or if there is one. How would you go about running a leak test?


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11little advice needed Empty Re: little advice needed 21st April 2017, 10:07 pm

shroom

shroom
moderator
moderator

Sounds a bit like this so maybe this is because of my cams... sure when I got the car back after the rebuild I didn't notice it but I did have a front exit exhaust so it was bloody stupid loud anyway.






_________________
Now Shagging sheep on the cheap
You wont find one that's for keeps
Spend the money, find a honey

'Shit' think I need to sell my Sunny!

But woman cant replace a sheep
Oh I wish that for the peace!
But I really cant find my honey
The only one I would give my money
Is one with a great big fleece
And then I would be at peace...

12little advice needed Empty Re: little advice needed 21st April 2017, 10:25 pm

Stu

Stu
Admin
Admin

Mine doesn't sound like those. Its like it drops a rev.


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13little advice needed Empty Re: little advice needed 22nd April 2017, 10:32 am

Mr B

Mr B
gtir technician
gtir technician

doesn't sound like cam timing to me, more like a fishbite misfire .
Always good assume nothing and look at everything though so if have doubt on chain could be idea have a look at it . I tend look at anything that becomes 'doubtful' as learned the hard way from assuming was done right don't solve the problem and keeps me awake at night pondering the dilemma lol, if it don't solve the problem it solves the doubt :-)

14little advice needed Empty Re: little advice needed 22nd April 2017, 11:50 am

Stu

Stu
Admin
Admin

Mr B wrote:doesn't sound like cam timing to me, more like a fishbite misfire .
Always good assume nothing and look at everything though so if have doubt on chain could be idea have a look at it . I tend look at anything that becomes 'doubtful' as learned the hard way from assuming was done right don't solve the problem and keeps me awake at night pondering the dilemma lol, if it don't solve the problem it solves the doubt :-)
Wise words B Smile thanks mate.
I took a video but the wind is louder than my exhaust note haha
And it makes the car sound like the engine needs shimming hahaha
Stupid shite phone mic.
Will get it in my mates unit when I can and take another video.


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15little advice needed Empty Re: little advice needed 22nd April 2017, 7:32 pm

GTI-R US

GTI-R US
Management
Management

It could be out a tooth as that will certainly make it lumpy and in general the 264 cams wont make the car idle poorly unless they are advanced to the max on intake

You can check exhaust side by ignition timing.........so if that is where the dizzy sits and shes showing 18-20 degrees on the timing gun then you know the exhaust cam is set right, BUT that does not mean the intake cam is set right so only way to check that is by pulling the rocker cover off and physically check the cam position

In general an sr20det will not have valve to piston contact unless the cam timing is out by around 5 teeth, unless the head has been skimmed by a large degree, block has been decked or the valve lift on chosen cams is excessive which isnt the case with the Hks 264s

Also check chain tensioner to make sure that its operating correctly both hydraulicly and manually as we had a car in recently where the mechanical side of tensioner had failed so on lift off the chain went loose so timing was all over the place on run down


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16little advice needed Empty Re: little advice needed 22nd April 2017, 8:11 pm

Stu

Stu
Admin
Admin

Thanks for that Bob.
I was going to replace the timing chain tensioner anyways.
I have new gaskets for the rocker cover to do also so will double check the cam timing.
The dizzy is set to 20°


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17little advice needed Empty Re: little advice needed 22nd April 2017, 8:25 pm

gtir_woody

gtir_woody
moderator
moderator

Has it been like this since it was rebuilt Stu?

18little advice needed Empty Re: little advice needed 22nd April 2017, 9:02 pm

Stu

Stu
Admin
Admin

gtir_woody wrote:Has it been like this since it was rebuilt Stu?
I cant remember Chris.
We rebuilt it in 2009 and then I sold the car and bought it back a few years later.
I think it might have been tho.


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19little advice needed Empty Re: little advice needed 22nd April 2017, 9:21 pm

gtir_woody

gtir_woody
moderator
moderator

Oh I didn't realise it was so long ago! anything could have seen touched over that time I guess Smile

20little advice needed Empty Re: little advice needed 22nd April 2017, 9:38 pm

Stu

Stu
Admin
Admin

Yeah its been a few years mate.
When I got it back some vacuum hoses were missing off the back of the plenum that I didn't see for over a year Embarassed
I will get to the bottom of it one day lpl
I have a few things to check over the next couple of months tho lol


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21little advice needed Empty Re: little advice needed 22nd April 2017, 10:35 pm

Gostek

Gostek
Events Organiser
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GTI-R US wrote:
In general an sr20det will not have valve to piston contact unless the cam timing is out by around 5 teeth, unless the head has been skimmed by a large degree, block has been decked or the valve lift on chosen cams is excessive which isnt the case with the Hks 264s

That's good to know


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