nyzrox
Member
Registered: 19th Jan 06
Location: Nottinghamshire Drives: MK4 Astra GSi
User status: Offline
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quote:
Originally posted by steveboyslim
Were the pistons made special ?
There does not apear to be a listing for the ZLET.
When I used/supplied Omegas for the ZLET I machine the crown slightly to lower the compression, so you can run a bit more ignition without deternation.
Steve
There 87m Accralites.
Heres the crown
An the important part
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Ollie_B
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Registered: 1st Jun 08
Location: North Wales/Wirral
User status: Offline
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453 ft/lb 
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steveboyslim
Member
Registered: 20th Sep 00
Location: herts
User status: Offline
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quote:
Originally posted by nyzrox
quote:
Originally posted by steveboyslim
Were the pistons made special ?
There does not apear to be a listing for the ZLET.
When I used/supplied Omegas for the ZLET I machine the crown slightly to lower the compression, so you can run a bit more ignition without deternation.
Steve
There 87m Accralites.
Heres the crown
If they are 8.5:1 C20LET pistons which they look like compression will be a bit high, was the total capacity of the combustion area measured ?
I remove the middle lump on the piston.
Steve
[Edited on 03-10-2009 by steveboyslim]
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nyzrox
Member
Registered: 19th Jan 06
Location: Nottinghamshire Drives: MK4 Astra GSi
User status: Offline
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Abit high? Would you want 9:1 being thats what Zlets are. Not sure regarding the measuring, isnt my engine.
No the lump was still there as that engine had a failure running 1.9bar and the block cracked between the cyclinder bore and water chamber however only 1 piston damaged.
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MarkSport
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Registered: 22nd May 09
User status: Offline
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is it only me who can't see none of the pictures on page 1?
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steveboyslim
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Registered: 20th Sep 00
Location: herts
User status: Offline
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quote:
Originally posted by nyzrox
Abit high? Would you want 9:1 being thats what Zlets are. Not sure regarding the measuring, isnt my engine.
I would not run 9:1, with those pistons, if I remember corrcetly compression will be higher than standard.
Do you have access to any of the mapping data, the ignition tables ?
Something of interest http://www.vx220.org.uk/forums/The-Fastest-Speedster-vx220-Yet-t52502.html&mode=threaded&pid=677470
Not that I am saying you need a GT35R, but some other usefull information
Steve
[Edited on 04-10-2009 by steveboyslim]
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nyzrox
Member
Registered: 19th Jan 06
Location: Nottinghamshire Drives: MK4 Astra GSi
User status: Offline
|
quote:
Originally posted by MarkSport
is it only me who can't see none of the pictures on page 1?
My bandwidth ranout on Photobucket mate, im working on some hosting off my mates server to upload all my stuff. Unlimited Bandwidth
quote:
Originally posted by steveboyslim
I would not run 9:1, with those pistons, if I remember corrcetly compression will be higher than standard.
Do you have access to any of the mapping data, the ignition tables ?
Something of interest http://www.vx220.org.uk/forums/The-Fastest-Speedster-vx220-Yet-t52502.html&mode=threaded&pid=677470
Not that I am saying you need a GT35R, but some other usefull information
Steve
[Edited on 04-10-2009 by steveboyslim]
Why not run 9:1, isnt that a good compression being itll take less boost then it would when 8.5:1 to get a power figure?
I dont have access, i can ask Jonny if he does if you want to see? Hes running DTA P8 Pro.
Il have a read at the thread. Ive considered 35, but i was looking at 3076 being itll be quite quick to spool with ar .60.
Thanks for your info Steve.
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