Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[Webby the Bear]

Right, I think I've been using some incorrect terms.

So.

As discussed previously there is no massive carbon build upin modern engines. That's fine.

But would a thin layer of crud build up in the ports cause a loss of bhp?

im thinking that having cylinder heads CHEMICALLY CLEANED.....would that gain me some horses. this would put valves, inlet ports and exhaust ports back to original spec.

again, not wanting to improve from factory (yet) so polishing and porting not needed at this stage. just want to get the heads back to original spec. will this chemical clean gain me horses?

[Webby the Bear]

*edit

will this get me horses BACK?

 

[Shackeng]

Unless they are literally coked, but just have a thin coating of carbon in those rough areas where the OE machining has left roughness, I suspect it will not gain anything worth having. Polishing and porting may well do however.

[05omegav6]

Easiest way to find out what a factory fresh Omega is capable of is to fit a brand new engine and box to your car and try again

[Rods2]

Lol some comics hiding in the OOF closets 

Ok, so thanks to sir tigger for the app. That is certainly a more reasonable price (£9.99) for being able to test. But I wonder how accurate it is. But worth a try for a tenner.

If you get 9.2, you'll say it's accurate, if you get 9.8, you'll say it lies.

If it was 14.8secs, you'll say it's like a 1.4 Astra.

[Kevin Wood]

Lol some comics hiding in the OOF closets 

Ok, so thanks to sir tigger for the app. That is certainly a more reasonable price (£9.99) for being able to test. But I wonder how accurate it is. But worth a try for a tenner.

If you get 9.2, you'll say it's accurate, if you get 9.8, you'll say it lies.

If it was 14.8secs, you'll say it's like a 1.4 Astra laugh.

Fixed.

[Webby the Bear]

Unless they are literally coked, but just have a thin coating of carbon in those rough areas where the OE machining has left roughness, I suspect it will not gain anything worth having. Polishing and porting may well do however.

Thanks Shackeng. our garage works closely with a cylinder head shop so ill report my findings.

taxi... you may be right. how much is a brand new 3l engine 

[05omegav6]

Last time I enquired, less than four VAG diesel injectors

[Webby the Bear]

lol that'll be about 2 million English dollars then 

[Webby the Bear]

Ok, so just heard back from the chap at the cylinder head shop. He's basically confirmed pretty much what you guys said....the carbon build up wont affect the performance that I MAY be missing and a acid dip wont be required. That's great.

However, one interesting thing he;s said....

to try a cylinder leak down as well.

this poses the question....

Can you have great compression but have some cylinder leakage through either the valves, hg or rings?

wehave a kit at work so though it would be a ball ache getting each piston to TDC and having to get to thatawkward pot 6 I will do it if needed.

Would really love to hear your thoughts?

[Rods2]

Talking of optimising the engine, blueprinting it will help, although probable not as much as it used to due to better machining tolerances on modern engines.

Such were production tolerances in the 1960's Ford used to measure and fit the 'right sized' piston for each bore.

[Jimbob]

I suppose youre only really looking at half the story here.

How close can you get to the described top speed?

* Jimbob runs as that should be good for another 30 pages

[05omegav6]

Should be good for 130... but being a 2.5 it will probably take all 30 pages to get there...

[Migv6 le Frog Fan]

Just when we hoped the end was nigh.......

[Gaffers]

After all the stuff coming out about VAG and their emmissions malarkey in North America I am not sure I would trust any figures given by any retailer on performance, emmisions or otherwise.

I also think that the revelations thus far might just be tip of the iceburg