garage19
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| posted on 11/2/04 at 01:12 PM |
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Vauxhall XE clearances
I need the bore tolerances and little end tolerances for a 16v XE lump.
Does any one have a Haynes manual that covers the early Astra GTE 16v engine which would have these dimensions in it?
I have done some research and have come up with a clearance of 0.03mm greater diameter for the bore over the piston diameter. But would like someone
to confirm this.
The pistons i am using are forged ones from the early GTE.
Ned, can you help?
Any help help would be really appreciated as the block and rods are off to Scholar at the end of the week for machining!!
Ta,
Doug.
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ned
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| posted on 12/2/04 at 09:48 AM |
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i have one, if i remember i'll bring the haynes in tomorrow.
Ned.
beware, I've got yellow skin
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garage19
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| posted on 12/2/04 at 10:48 AM |
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Thanks ned, much appreciated.
I think that will make it two beers i owe you!
Doug.
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ned
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| posted on 13/2/04 at 04:22 PM |
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Doug,
I got the haynes in to the car then forgot it when i got out to go to the station!
will try and remember again for monday if still required.
ned.
beware, I've got yellow skin
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DavidC
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| posted on 14/2/04 at 10:54 AM |
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Is this any use to you?
Haynes Page
DC
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garage19
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| posted on 14/2/04 at 06:47 PM |
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David,
Thanks, that is brilliant. My pistons have 99 on the crown so i will bore to 85.99 mm.
Don't suppose you have a copy of the page with the little end sizes on as i also have to alter my rods?
Thanks again,
Doug.
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david walker
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| posted on 14/2/04 at 08:46 PM |
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Std bore is 86mm and thats exactly what you bore to.
Running clearance will vary according to use - .03mm OK for road, .07mm for race.
XE gudgeon pin is 21mm dead. If new little ends are being fitted (unusual as they really do last well) - then the machine shop will hone until they
achieve the correct sliding fit. This is they will do by feel, not by gauging.
If Scolar are doing your machining then why do you ask - please don't insult them by telling them how to do their job!
By the way if you are looking to achieve .03mm running clearance on an old XE block, I promise you you'll need liners fitting, and its cheaper
to rebore and fit 0.5mm pistons.
Dave Walker, Race Engine Services - 07957 454659 or 01636 671277
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garage19
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| posted on 15/2/04 at 11:27 AM |
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quote:
Originally posted by david walker
"Std bore is 86mm and thats exactly what you bore to".
Ok, that makes sense.
"Running clearance will vary according to use - .03mm OK for road, .07mm for race".
It going to be a forced induction engine so i gues i'll go for the tighter tolerance to prevent blow by?
"XE gudgeon pin is 21mm dead. If new little ends are being fitted (unusual as they really do last well) - then the machine shop will hone until
they achieve the correct sliding fit. This is they will do by feel, not by gauging".
I am having to modify my zetec rods to take XE pistons/gudgeon pins. This involves increasing the diameter of the little end by 0.4mm.
"If Scolar are doing your machining then why do you ask - please don't insult them by telling them how to do their job!"
I don't want to insult them, just be armed with all the information i need so i don't look a prat if they ask me what bore clearance i
want. I would of thought finding out the manufacturers recommended tolerances for the parts you are going to put in an engine is just common sense!
"By the way if you are looking to achieve .03mm running clearance on an old XE block, I promise you you'll need liners fitting, and its
cheaper to rebore and fit 0.5mm pistons".
It probably is but i'm increasing the bore of my 85mm zetec engine to fit XE pistons not fitting new pistons to an XE!
Doug.
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david walker
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| posted on 15/2/04 at 04:17 PM |
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Ah, well why didn't you say!
Best of luck with it,
Dave
Dave Walker, Race Engine Services - 07957 454659 or 01636 671277
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garage19
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| posted on 15/2/04 at 05:51 PM |
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Sorry if i forgot to mention it.
The XE pistons are a common trick used (because of their lower deck height) to lower the CR of 2ltr zetec lumps!
Just so happens the early GTE ones were forged which makes them even more suitable.
Doug.
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ned
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| posted on 16/2/04 at 09:39 AM |
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Lugged the haynes into work, though it seems you don't need the info now, DOH!
Ned.
beware, I've got yellow skin
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garage19
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| posted on 16/2/04 at 01:40 PM |
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Sorry ned, thanks for the effort. Did you ever get rid of your used set of pistons in the end?
Doug.
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ned
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| posted on 16/2/04 at 01:44 PM |
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Doug,
I still have my early mahle pistons, not sure why but i decided to hold onto them for a while...
Ned.
beware, I've got yellow skin
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