12:1
Regards
Brad HALLETT
http://www.powerup.com.au/~bhallett
Proudly Endorsing:
...DATRATS...
http://203.33.35.34
Datsun Dedicated
For Nissan Motorsport Components
Professional Budget Priced competition equipment
Contact Errol SMITH
email: [EMAIL PROTECTED]
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Heath
Sent: Friday, September 29, 2000 11:48 PM
To: [EMAIL PROTECTED]
Subject: Re: VG30 Piston pin height?
what compression ratio r u running Brad?
around 13:1 . 14:1?
Heath
----- Original Message -----
From: "Brad HALLETT" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, 29 September 2000 7:00
Subject: RE: VG30 Piston pin height?
> That is great that you can sorce VG30 pistons like that. I am still going
> to stick with forged slugs as they are just more reliable for my setup.
My
> engine will be racing and rallying so it will be required to handle a
large
> range of temperatures and sever rev changes, as well as cope with high
> compression. Ceramic coating is a good idea, and if you talk to the boys
> right they may also do your extractors which makes quite a difference.
>
> By the way I couldn't really afford the head either but I wasn't going to
> let the chance slip by this time!
>
> Keep me posted
>
> Regards
> Brad HALLETT
> http://www.powerup.com.au/~bhallett
>
> Proudly Endorsing:
> ...DATRATS...
> http://203.33.35.34
> Datsun Dedicated
> For Nissan Motorsport Components
> Professional Budget Priced competition equipment
> Contact Errol SMITH
> email: [EMAIL PROTECTED]
>
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Craig Overend
> Sent: Friday, September 29, 2000 1:46 PM
> To: [EMAIL PROTECTED]
> Subject: Re: VG30 Piston pin height?
>
>
> Brad,
> I posted Lindsay Siebler at Pistons auto parts in Vic
> <[EMAIL PROTECTED]> regarding the oversize VG30 pistons and his
> reply is below.
>
> Hi Craig
> 300 zx pistons are avail in 1.00mm They have a flat top with 2 offset
> valve
> reliefs. Are circlip type with 21.00mm pin and crown height is 32.00mm.
> They will cost you with chrome rings $299.00 incl gst
> Lindsay
>
> While I agree they won't be as good as forgies they're probably the next
> best thing. I was considering having the piston tops ceramic coated
> aswell, which would reduce crown temps by approx 7% for added
> reliability. For $299 they are a lot cheaper. Just depends what you want
> to use them for. The forgies would suit your application better I agree.
> I'm after something a little milder. I can't afford an FIA head! :(
> I don't see a high CR being the problem as long as there is no major
> detonation present, which results in huge cylinder pressure increases. I
> consider high temperature at the crown and top ring land caused by
> detonation, lean mixtures or inadequate cooling/lubrication more likely
> the cause of failures. I thought of using an oil spray for under the
> piston crown aswell as an option, not sure though. I've also thought
> about running fairly tight piston to head tolerances to limit combustion
> to a modified peanut chamber, which should reduce temps at the top ring
> land and reduce combustion time.
> I welcome any thoughts.
>
> Craig.
>
> Brad HALLETT wrote:
> >
> > Craig,
> > I am getting 88mm flat top forged slugs with 33mm compression height
from
> > Australian Precision engine parts. $220+GST each including sealed power
> > gapless rings, pins and circlips. Good price and excellent product. I
> > looked for VG30 pistons but had a lot of trouble sorcing them and I do
not
> > think they will handle high CR.
> >
> > Regards
> > Brad HALLETT
> > http://www.powerup.com.au/~bhallett
> >
> > Proudly Endorsing:
> > ...DATRATS...
> > http://203.33.35.34
> > Datsun Dedicated
> > For Nissan Motorsport Components
> > Professional Budget Priced competition equipment
> > Contact Errol SMITH
> > email: [EMAIL PROTECTED]
> >
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED]]On Behalf Of Craig Overend
> > Sent: Wednesday, September 27, 2000 1:51 AM
> > To: [EMAIL PROTECTED]
> > Subject: Re: VG30 Piston pin height?
> >
> > Eddie,
> > they're for an L series. I am after some 88mm flattops with
about
> 32mm
> > pin height. I saw they were 87mm standard and thought they may be a good
> > piston if they are available in 1mm oversize at the right pin height.
> > I'd prefer not spending big money on custom pistons if I can avoid it. I
> > found some really good pictures of them at
> > http://www.overboost.com/story.asp?id=129
> > I see what you mean about the valve reliefs. I will be machining my own
> > reliefs in whatever pistons I get anyway.
> >
> > Thanks,
> > Craig.
> >
> > [EMAIL PROTECTED] wrote:
> > >
> > > Craig, The dish isn't actually a dish just the valve cutouts which
> > amounts
> > > to 1cc so it's not really neccesary to machine them. I think the pin
is
> > 21mm
> > > same as other Nissan engines. There are two types of piston, one uses
a
> > > pressed in pin and the other has a fully floating one but I am not
> certain
> > > of the difference in the rings. These specs are from the Z31 (300ZX)
> > > non-turbo and I believe are the same for the Y30 (300C) but as we
never
> > got
> > > the V6 in anything else here I can't be sure of the pathfinder specs.
> What
> > > are you planning with a VG?
> > >
> > > Cheers,
> > > Eddie
> > > England
> > > 510, KP710, B10, KB110,
> > > B110, B120, J710, H230,
> > > G620, P330, SRL311, C30,
> > > VBF10, F10, S12
> > > [EMAIL PROTECTED]
> > > pics at www.ratdat.com
> > >
> >
>
>
>
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