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Home > Help Needed / General Tech Chat > Cam timing and boost troubles

Steve220

108 Posts
Member #: 11017
Advanced Member

Shropshire

Right, since rebuilding my engine I've had boosting issues, it feels like it's holding back loads. The only thing that's changed is the turbo is reconditioned and the engine is now 1310cc and 9.1:1 compression ration from 8.8:1 previously. When I took the engine apart, I took the cam and crank sprockets off together with the chain and cable tied it altogether to prevent loss of timing.

As I was in a rush to get it back on the road, I never checked whether the timing was the same on the cam (Sw5). If it was out a degree or 2, could it cause the effect I'm having? Or am I clutching at straws?


Joe C

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12245 Posts
Member #: 565
Carlos Fandango

Burnham-on-Crouch, Essex

one tooth is 13 or 16 teeth IIRC, thats a lot of timing, would probably half the power or less.

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/



Joe C

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12245 Posts
Member #: 565
Carlos Fandango

Burnham-on-Crouch, Essex

just a thought, the SW5 is the same lift on inlet and exhaust, so with no 1 at tdc you should have no 4 ( or would it be 3) with equal ift on inlet and exhaust ( or very close)

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/



Steve220

108 Posts
Member #: 11017
Advanced Member

Shropshire

Hi Joe, I'm pretty sure it didn't skip a tooth, the engine actually idles and drives nicely, however it really struggles getting into boost and keeping it steady. Checked everything else and I'm running out of ideas!


burcy35

161 Posts
Member #: 10990
Advanced Member

Hornsea

Is the dump valve sealing as it should or could it be wastegate related I wonder.

Just a thought.


Steve220

108 Posts
Member #: 11017
Advanced Member

Shropshire




On 2nd Aug, 2019 burcy35 said:
Is the dump valve sealing as it should or could it be wastegate related I wonder.

Just a thought.


Tried those both. Blocked off the DV and it still does it. The actuator has been replaced with a Forge Motorsport item and still does it. It's almost as if the exhaust gasses are struggling to turn the turbo, but it went back to the place that rebuilt it and its fine!


Tom Fenton
Site Admin

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15251 Posts
Member #: 337
Fearless Tom Fenton, Avon Park 2007 & 2008 class D winner

&

TM legend.

Rotherham South Yorkshire

Exhaust or air filter restrictions?


On 29th Nov, 2016 madmk1 said:


On 28th Nov, 2016 Rob Gavin said:
I refuse to pay for anything else


Like fuel 😂😂


Steve220

108 Posts
Member #: 11017
Advanced Member

Shropshire



On 2nd Aug, 2019 Tom Fenton said:
Exhaust or air filter restrictions?


Neither have changed from before the engine blew/when it ran better! *frown* I ran it without a filter and only the downpipe and it still does the same thing

Edited by Steve220 on 2nd Aug, 2019.


John

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9984 Posts
Member #: 1456
Topping Geezer

Barnsley, South Flatcapshire

Like Mike leaving a pile of blue roll in the intercooler!


On 2nd Aug, 2019 Tom Fenton said:
Exhaust or air filter restrictions?

If something is worth doing, it's worth doing half of.


Joe C

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12245 Posts
Member #: 565
Carlos Fandango

Burnham-on-Crouch, Essex

mmm,

could be retarded, when i was faffing with a mates K100 it was flat as a witches tit after about 3500rpm, after cheking the cam timing and advancing it a bit and closing up the LCA it was a totally different car.

for the sake of sticking it on TDC and poppig the rocker cover off I'd check it.


On 2nd Aug, 2019 Steve220 said:
Hi Joe, I'm pretty sure it didn't skip a tooth, the engine actually idles and drives nicely, however it really struggles getting into boost and keeping it steady. Checked everything else and I'm running out of ideas!

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/


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