Engine: S60: - high compression engines...

grainqey · Jun 13th, 2009, 18:46

hiya,
im just wondering what makes the 2.4 and 2.5t lumps high compression as i read somewhere the two engines are high comp low boost engines as opposed to the 2.3 and 2.5(R) low compression lumps using high boost

cant you just buy forged pistons/ head with larger compression chambers to lower the compression ratio and increase the boost to basically make a 2.4R lol

just been reading a vauxhall forum i used to use and remembered the high compression and low compression engines

thanks

grainqey · Jun 13th, 2009, 18:57

just to add, ferriday engineering make decompression plates (i looked into decomp plates with an omega (x25 V6 lump) when i was going to put a turbo on lol)

Chris_Rogers · Jun 13th, 2009, 19:03

The high boost engines are strenghened internally so it's not just compression ratio that matters.

Quite honestly it would be much more cost effective to change the engine for a high boost one.

Having had both types I've found that for normal road use the low boost ones are much nicer to drive and nippier around town.

grainqey · Jun 13th, 2009, 20:01

Quote:

Originally Posted by Chris_Rogers

The high boost engines are strenghened internally so it's not just compression ratio that matters.

Quite honestly it would be much more cost effective to change the engine for a high boost one.

Having had both types I've found that for normal road use the low boost ones are much nicer to drive and nippier around town.

yeah i know what you mean about them being nippy, there's pretty much no lag (it does have it's downsides though like when you go to set off slowly lol) "oops, bit to much light throttle"

do you know how the T5 and R lumps are internally strengthened? like is it the head thats strengthened or the bottom end?

thanks

Chris_Rogers · Jun 14th, 2009, 09:20

It think it's pretty much all of it, there are also additional oil spray pipes and uprated cylinder liners from memory.

grainqey · Jun 14th, 2009, 13:18

Quote:

Originally Posted by Chris_Rogers

It think it's pretty much all of it, there are also additional oil spray pipes and uprated cylinder liners from memory.

wouldnt mind getting my hands on one of the 2.5R engines :P
..yes mr.boy racer it's only a 2.4t honest

Jun 13th, 2009, 18:46	#1
grainqey Master Member Last Online: Feb 23rd, 2021 00:40 Join Date: Jan 2009 Location: rotherham	high compression engines... hiya, im just wondering what makes the 2.4 and 2.5t lumps high compression as i read somewhere the two engines are high comp low boost engines as opposed to the 2.3 and 2.5(R) low compression lumps using high boost cant you just buy forged pistons/ head with larger compression chambers to lower the compression ratio and increase the boost to basically make a 2.4R lol just been reading a vauxhall forum i used to use and remembered the high compression and low compression engines thanks

Jun 13th, 2009, 18:57	#2
grainqey Master Member Last Online: Feb 23rd, 2021 00:40 Join Date: Jan 2009 Location: rotherham	just to add, ferriday engineering make decompression plates (i looked into decomp plates with an omega (x25 V6 lump) when i was going to put a turbo on lol)

Jun 13th, 2009, 19:03	#3
Chris_Rogers VOC Member Last Online: Apr 10th, 2017 16:55 Join Date: Jan 1970 Location: South Kent Coast	The high boost engines are strenghened internally so it's not just compression ratio that matters. Quite honestly it would be much more cost effective to change the engine for a high boost one. Having had both types I've found that for normal road use the low boost ones are much nicer to drive and nippier around town.

Jun 14th, 2009, 09:20	#5
Chris_Rogers VOC Member Last Online: Apr 10th, 2017 16:55 Join Date: Jan 1970 Location: South Kent Coast	It think it's pretty much all of it, there are also additional oil spray pipes and uprated cylinder liners from memory.

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