Engine: 2.5: - 10v Head Skimming to increase Power?

DmcL · Jan 3rd, 2009, 16:36

as above.. anyone any idea what amount would need to be skimmed off to notice any performance increases?

headgasket went and im thinking ill get the head skimmed to be safe when putting it all back together then i got to thinking if im getting it skimmed anyway it would be a good excuse to see about getting more skimmed off to increase compression. the car is rarely run on anything less than 95 octane petrol from shell so shouldnt have to worry about that aspect..

ovlov25 · Jan 6th, 2009, 17:04

You'd see more performance running on 97 ron fuel than any amount of skimming. It won't be much either way.

Clan · Jan 6th, 2009, 19:17

head skimming for increased efficiency was for low compression engines from the 60's , doing this to a modern high efficiency high compression engine will cause no end of problems , volvo stipulate a minimum head thickness any more than about 0.004" off is too much ...

badger1980 · Jan 10th, 2009, 20:58

Maybe be best to get it ported and polished rather than getting it skimmed

Clan · Jan 10th, 2009, 22:28

it will flow more air then and put the engine managment light on .. Its not easy tuning modern engines unless you use something like an emerald M3D engine managment computer ...

angusvolvo · Feb 2nd, 2009, 16:34

Chap I have read some of your other posts on this forum.

If you want performance buy a T5.

Wasting good money "improving" a 10v 2.5 is financial suicide.

Take it from me I've had an 855 2.5 10v for nearly six years! (Bought for a pittance and done near on 50,000 miles in my ownership)

In that time prices have dropped like stones and cheap T5's are now in abundance.

I know where you could get a £1500 (plus haggling) 850 T5R with 168k see below:
http://www.vpcuk.org/forums/showthread.php?t=17677

Its worth thinking about.

Cheers

imac · Feb 2nd, 2009, 16:47

Have to agree with the last poster, it would be cheaper to sell and buy a T5 than chase a few horsepower in your 10v.

There are a few around in excellent condition, but they come up less often now as most have reached the 'Council Estate Ferrari' stage and subsequently not been looked after in the way they should be.

Jan 3rd, 2009, 16:36	#1
DmcL WTF? Last Online: Apr 30th, 2009 18:22 Join Date: Sep 2008 Location: Derry, N.I.	10v Head Skimming to increase Power? as above.. anyone any idea what amount would need to be skimmed off to notice any performance increases? headgasket went and im thinking ill get the head skimmed to be safe when putting it all back together then i got to thinking if im getting it skimmed anyway it would be a good excuse to see about getting more skimmed off to increase compression. the car is rarely run on anything less than 95 octane petrol from shell so shouldnt have to worry about that aspect.. __________________ 1989 325i SE, 1991 740GL

Jan 6th, 2009, 17:04	#2
ovlov25 Premier Member Last Online: Aug 1st, 2022 23:02 Join Date: Nov 2007 Location: Antrim	You'd see more performance running on 97 ron fuel than any amount of skimming. It won't be much either way. __________________ I want I want I want!!!

Jan 6th, 2009, 19:17	#3
Clan Experienced Member Last Online: Yesterday 22:51 Join Date: Jun 2007 Location: L/H side	head skimming for increased efficiency was for low compression engines from the 60's , doing this to a modern high efficiency high compression engine will cause no end of problems , volvo stipulate a minimum head thickness any more than about 0.004" off is too much ... __________________ My comments are only based on my opinions and vast experience .

Jan 10th, 2009, 20:58	#4
badger1980 Junior Member Last Online: May 1st, 2010 00:10 Join Date: Sep 2008 Location: stoke on trent	Maybe be best to get it ported and polished rather than getting it skimmed __________________ Volvo 850 T5 2.3 Turbo 1996/1997

Jan 10th, 2009, 22:28	#5
Clan Experienced Member Last Online: Yesterday 22:51 Join Date: Jun 2007 Location: L/H side	it will flow more air then and put the engine managment light on .. Its not easy tuning modern engines unless you use something like an emerald M3D engine managment computer ... __________________ My comments are only based on my opinions and vast experience .

Feb 2nd, 2009, 16:34	#6
angusvolvo Junior Member Last Online: Sep 14th, 2009 11:42 Join Date: Jun 2006 Location: VERY COLD	Chap I have read some of your other posts on this forum. If you want performance buy a T5. Wasting good money "improving" a 10v 2.5 is financial suicide. Take it from me I've had an 855 2.5 10v for nearly six years! (Bought for a pittance and done near on 50,000 miles in my ownership) In that time prices have dropped like stones and cheap T5's are now in abundance. I know where you could get a £1500 (plus haggling) 850 T5R with 168k see below: http://www.vpcuk.org/forums/showthread.php?t=17677 Its worth thinking about. Cheers __________________ Volvo 855 2.5 10v CD manual 1996 N Absolutely everything except a damn turbo! Owned 5+ years

Feb 2nd, 2009, 16:47	#7
imac Premier Member Last Online: Sep 19th, 2009 21:23 Join Date: Nov 2003 Location: Hove, Actually.	Have to agree with the last poster, it would be cheaper to sell and buy a T5 than chase a few horsepower in your 10v. There are a few around in excellent condition, but they come up less often now as most have reached the 'Council Estate Ferrari' stage and subsequently not been looked after in the way they should be. __________________ MY97 S70 T5 CD - Now with added Milltek!

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