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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