KV TSR or GTI ENGINEERING 2.5 conversion - Page 6

msh · 19-01-16, 05:21 AM

You're mistaking two things. Stroke doesn't outright affect performance, only longevity of engine, if engine hasn't been configured properly. For sport applications the speed of piston is calculated, and I doubt that such stroke would be problem for engine which revs only to 7,5k - presuming that european ford don't have much different cylinder dimensions than VAG, if ford 2.0 16v could be made to rev to 12k, then 7,5k for 2.6 is nothing. The other thing is reprocipating mass [sorry if I wrote that incorrectly

] and vibrations.And that's why I made that question, because heavier crank can both make more vibrations and due to higher rotating mass, the engine without load won't accelerate as fast - important for some, as we can see from the fact that some lighten their flywheels - but unimportant for most - but I guess there could be quite a lot people around thinking that lighter flywheel [and in this case, also crank] is better...

simons2 · 22-01-16, 03:45 PM

I now have the diesel 5 pot and I'm stripping it down in the back of my van! Let the games begin!

simons2 · 05-05-16, 05:52 PM

Hello All.
Need a little help please. I'm after an 81mm piston the same as the KV one but with a smaller gap between the crown and gudgeon pin.
If you have any 81mm pistons knocking about with a 20mm gudgeon pin please can you measure that gap and let me know what engine they were from, I don't think I can machine the standard piston enough to forge the gap.
Thanks in advance.

slacky · 29-12-16, 08:33 PM

Any progress Simon ?

simons2 · 30-12-16, 08:57 AM

Steve how's it going??
I think I have all the parts I need now. Pistons have been machined to suit. Block needs alittle work to clearance the rod nuts and then I can start and put it together.
I have a lightened flywheel which I may use to offset the extra crank weight. I've a high lift cam and new light weight lifters.
Last part of the puzzle is an exhaust manifold flange as I plan to make a tubular manifold from parts I have.
Thanks for asking Si

slacky · 30-12-16, 09:40 AM

Quote:

Originally Posted by simons2

Steve how's it going??
I think I have all the parts I need now. Pistons have been machined to suit. Block needs alittle work to clearance the rod nuts and then I can start and put it together.
I have a lightened flywheel which I may use to offset the extra crank weight. I've a high lift cam and new light weight lifters.
Last part of the puzzle is an exhaust manifold flange as I plan to make a tubular manifold from parts I have.
Thanks for asking Si

It progressing nicely then

, look forward to further updates

Regards Chris
(Steve is my brother

)

simons2 · 30-12-16, 10:21 AM

Chris how did I manage that!! Slowly but yes progressing.
Thought if I can do 10v NA how about 20vT 2.5 stroker so bought rods to build one of those as well

, just after a head from a 3B if you know of anyone?
Cheers
Simon

Andy10v · 30-12-16, 11:51 AM

10v turbo exhaust headers flanges are on Marc Swanson's site on Jim Green's page as an AutoCAD file, I think you could use the head flange diagrams if you can get some cut cheaply? I think they are on theprojectpad as well.

£60 for a flange

http://swedenexhaust.se/en/audi/388-audi-5cyl-10.html

simons2 · 31-12-16, 08:51 AM

Thanks Andy I'll take a look at those sites.

audicoupeparts · 31-12-16, 10:53 PM

I finally had my gti stroker and diesel block turn up a couple of months back. I forgot about this thread.
May have persuaded myself to go 1.8t for some boost now though-anyone have a suitable body shell for me to fit this engine into?

29-12-16, 08:33 PM	#54
slacky 4 ring whore! Classic Audi Club Member Join Date: Nov 2007 Location: wirral Posts: 4,452	Any progress Simon ? __________________ *90q-Cab.2.3E-Ur-S6-b2-80 Sport* Member 111

30-12-16, 08:57 AM	#55
simons2 Grown up member Classic Audi Club Member Join Date: Jun 2012 Location: ireland Posts: 291	Steve how's it going?? I think I have all the parts I need now. Pistons have been machined to suit. Block needs alittle work to clearance the rod nuts and then I can start and put it together. I have a lightened flywheel which I may use to offset the extra crank weight. I've a high lift cam and new light weight lifters. Last part of the puzzle is an exhaust manifold flange as I plan to make a tubular manifold from parts I have. Thanks for asking Si Last edited by simons2; 30-12-16 at 09:02 AM.

30-12-16, 10:21 AM	#57
simons2 Grown up member Classic Audi Club Member Join Date: Jun 2012 Location: ireland Posts: 291	Chris how did I manage that!! Slowly but yes progressing. Thought if I can do 10v NA how about 20vT 2.5 stroker so bought rods to build one of those as well, just after a head from a 3B if you know of anyone? Cheers Simon

30-12-16, 11:51 AM	#58
Andy10v Grown up member Classic Audi Club Member Join Date: Dec 2008 Location: Stirling Posts: 861	10v turbo exhaust headers flanges are on Marc Swanson's site on Jim Green's page as an AutoCAD file, I think you could use the head flange diagrams if you can get some cut cheaply? I think they are on theprojectpad as well. £60 for a flange http://swedenexhaust.se/en/audi/388-audi-5cyl-10.html __________________ 2005 350z GT Sold-1992 3B S2 coupe-RS2+, 996s, konis, forged rods, rear torsen.... Sold-1993 ABY coupe

19-01-16, 05:21 AM	#51
msh 4 ring whore! Join Date: Jun 2008 Location: Rucava, Latvija Posts: 3,816	You're mistaking two things. Stroke doesn't outright affect performance, only longevity of engine, if engine hasn't been configured properly. For sport applications the speed of piston is calculated, and I doubt that such stroke would be problem for engine which revs only to 7,5k - presuming that european ford don't have much different cylinder dimensions than VAG, if ford 2.0 16v could be made to rev to 12k, then 7,5k for 2.6 is nothing. The other thing is reprocipating mass [sorry if I wrote that incorrectly ] and vibrations.And that's why I made that question, because heavier crank can both make more vibrations and due to higher rotating mass, the engine without load won't accelerate as fast - important for some, as we can see from the fact that some lighten their flywheels - but unimportant for most - but I guess there could be quite a lot people around thinking that lighter flywheel [and in this case, also crank] is better...

22-01-16, 03:45 PM	#52
simons2 Grown up member Classic Audi Club Member Join Date: Jun 2012 Location: ireland Posts: 291	I now have the diesel 5 pot and I'm stripping it down in the back of my van! Let the games begin!

05-05-16, 05:52 PM	#53
simons2 Grown up member Classic Audi Club Member Join Date: Jun 2012 Location: ireland Posts: 291	Hello All. Need a little help please. I'm after an 81mm piston the same as the KV one but with a smaller gap between the crown and gudgeon pin. If you have any 81mm pistons knocking about with a 20mm gudgeon pin please can you measure that gap and let me know what engine they were from, I don't think I can machine the standard piston enough to forge the gap. Thanks in advance.

31-12-16, 08:51 AM	#59
simons2 Grown up member Classic Audi Club Member Join Date: Jun 2012 Location: ireland Posts: 291	Thanks Andy I'll take a look at those sites.

31-12-16, 10:53 PM	#60
audicoupeparts Senior Member Classic Audi Club Member Join Date: Mar 2008 Posts: 1,161	I finally had my gti stroker and diesel block turn up a couple of months back. I forgot about this thread. May have persuaded myself to go 1.8t for some boost now though-anyone have a suitable body shell for me to fit this engine into?