Skiddell/Pmac Airbox

[Alphabettispaghetti]

They're pulling your leg. You've still got a day or two Jason.

can you share the details outside of the chamber!?

 

[AliK]

No white smoke from the chimney yet Franky, so you have to wait !!

 

[Alphabettispaghetti]

No white smoke from the chimney yet Franky, so you have to wait !!

you know what they say, where there's smoke, there's your old engine.

 

[240L31]

Did I miss the group buy? I became a member but didn't see the topic elsewhere?

 

[jonbills]

Did I miss the group buy? I became a member but didn't see the topic elsewhere?

nope, not happened quite yet.

 

[Alphabettispaghetti]

Did I miss the group buy? I became a member but didn't see the topic elsewhere?

See the plan works!

 

[Paul_S]

Here you go --> https://zclub.net/community/index.php?threads/member-offer-custom-airboxes-at-cost-price.27369/

 

[Alphabettispaghetti]

Here you go --> https://zclub.net/community/index.php?threads/member-offer-custom-airboxes-at-cost-price.27369/

Thanks, thats not too bad really is it.

 

[Alphabettispaghetti]

How many new members has the £2.54 airbox bought in so far?

 

[AliK]

How many new members has the £2.54 airbox bought in so far?

 

[Turn & Burn]

Jon, Do you have details of the inlet internal diameter, I’m wondering if they’ll be suitable for the larger engines? (Apologies for looking the gift horse in the mouth!)

 

[jonbills]

Jon, Do you have details of the inlet internal diameter, I’m wondering if they’ll be suitable for the larger engines? (Apologies for looking the gift horse in the mouth!)
View attachment 40223

I believe they are 89mm, as reported by Ritchie. https://zclub.net/community/index.php?threads/skiddell-pmac-airbox.27278/page-8#post-312886.

Where's your info on sizes from Andy? Steve Kiddells engine (the one he made, but no longer owns) makes 300bhp with one of these.

 

[Turn & Burn]

I believe they are 89mm, as reported by Ritchie. https://zclub.net/community/index.php?threads/skiddell-pmac-airbox.27278/page-8#post-312886.

Where's your info on sizes from Andy? Steve Kiddells engine (the one he made, but no longer owns) makes 300bhp with one of these.

I’d read that they ran a larger inlet on the higher hp motor. (From reading on the original airbox thread) The info quoted is from Reverie, airbox manufacturers.


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[jonbills]

I’d read that they ran a larger inlet on the higher hp motor. (From reading on the original airbox thread) The info quoted is from Reverie, airbox manufacturers.


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No I think the idea was that for smaller engines its OK to reduce the piping down to 76mm to fit through the standard rad panel but for higher capacity engines you need to open the rad panel hole up to run a 90mm pipe. Both cases use the same 89mm inlet to the airbox. Is that right @richiep?

 

[Rob Gaskin]

If you look at F3 racing car regulations they have had tiny inlets and yet still produce plenty of power.

Stock derived 3.4 L (207 cu in) engine with 28 mm (1.1 in) width restrictor, hence about 380 hp (280 kW) at 8000rpm

 

[Turn & Burn]

If you look at F3 racing car regulations they have had tiny inlets and yet still produce plenty of power.

Stock derived 3.4 L (207 cu in) engine with 28 mm (1.1 in) width restrictor, hence about 380 hp (280 kW) at 8000rpm

Can’t disagree with that, but it’s a highly developed orifice thats probably benefitting from ram effect and reliant on a very high flow velocity which we won’t have on a flexy hose. I’ve only quoted what the airbox manufacturer states, they have the theory to back their claims up on the website.


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[toopy]

No I think the idea was that for smaller engines its OK to reduce the piping down to 76mm to fit through the standard rad panel but for higher capacity engines you need to open the rad panel hole up to run a 90mm pipe. Both cases use the same 89mm inlet to the airbox. Is that right @richiep?

I'll step in as Richie hasn't replied yet, Yes basicly, Richies and most peoples will use a silicone reducer hose to fit the airbox inlet, to allow the use of 3" pipework to go through the rad panel.
89mm/3.5" reduced to 76mm/3"

 

[240L31]

How's it going on? Is there any time plan so far?

 

[richiep]

I'll step in as Richie hasn't replied yet, Yes basicly, Richies and most peoples will use a silicone reducer hose to fit the airbox inlet, to allow the use of 3" pipework to go through the rad panel.
89mm/3.5" reduced to 76mm/3"

Sorry, missed this entirely. The airbox inlet has an OD of 89mm. For cars up to 2.8ish, reducing this to 76mm/3” with a reducer connection allows for a system that works with the existing top hole in the rad support. For bigger displacements, i.e. 3.0+ strokers like the ex-Steve Kiddell car that Matt B owns, the optimal approach is to go for a minimum of 3.5”/89mm - no reducer, meaning a larger hole needs to be made in the rad support, around the position of the middle hole.

 

[Turn & Burn]

Sorry, missed this entirely. The airbox inlet has an OD of 89mm. For cars up to 2.8ish, reducing this to 76mm/3” with a reducer connection allows for a system that works with the existing top hole in the rad support. For bigger displacements, i.e. 3.0+ strokers like the ex-Steve Kiddell car that Matt B owns, the optimal approach is to go for a minimum of 3.5”/89mm - no reducer, meaning a larger hole needs to be made in the rad support, around the position of the middle hole.

Thanks for the update.
Just for anyone that hasn’t checked the 260z has larger ports in the rad support, at a push I think you can get a 100mm spiral hose thro. It measures 97mm in one plain and 103mm in the other.