Cold air intake box | The Z Club of Great Britain
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Cold air intake box

Discussion in 'General' started by toopy, Jan 28, 2020.

  1. toopy

    toopy
    Z Club Member

    The main piece i still need so i can do the cold air intake conversion, i had planned to order from Mike after Xmas, but very sadly that is now no longer possible.
    Ive had a look around online but couldn't find anything similar, anybody know where else i could source one please?
     
  2. franky

    franky Well-Known Forum User

    I've a few links I'll dig out, R-factory Japan springs to mind.
     
  3. atomman

    atomman
    Z Club Member

  4. jonbills

    jonbills
    ZClub Administrator
    Moderator

    They're expensive - There used to be a much cheaper TWM/Borla one, but looks like it's not available any more.
     
  5. atomman

    atomman
    Z Club Member

    that's why i made one
     
    jonbills likes this.
  6. toopy

    toopy
    Z Club Member

    Where did Mikes come from then? iirc they were on the MJP website for around £150+
     
    Mr Ex Jnr likes this.
  7. jonbills

    jonbills
    ZClub Administrator
    Moderator

    He acquired the design from pmac and had them made himself I believe.
     
  8. toopy

    toopy
    Z Club Member

    Ah right, that would explain why i couldn't find it listed anywhere else, thought i was going mad!
     
  9. MaximG

    MaximG
    Z Club Member

    They were made in carbon fibre initially, Steve Kiddell had a hand in its design.
     
  10. toopy

    toopy
    Z Club Member

    It would appear i missed the boat on that last production run then :(
     
  11. richiep

    richiep
    Z Club Member

    I hadn’t considered this; I need another for Dixie’s engine, but hadn’t got around to ordering one. :(

    Looks like I might be reverse engineering the one I’ve got on the Fairlady Z then...
     
  12. franky

    franky Well-Known Forum User

    very very similar to the R factory one.
     
  13. jonbills

    jonbills
    ZClub Administrator
    Moderator

    both are similar to the TWM one and home made ones I've seen. I don't think there's a lot of scope for variety.
    It's a box that's as long as the L head and has to fit in with the shape of the engine bay.
     
  14. Mr Ex Jnr

    Mr Ex Jnr
    Z Club Member

    I was wanting a air box a while ago.and have never managed to get one yet at a reasonable price

    I'd be interested if someone could get a batch made
     
    toopy likes this.
  15. toopy

    toopy
    Z Club Member

    That's true, but similar isn't the same, having seen how good the MJP example looks installed in Richie's and Woody's cars, that's exactly what i wanted.

    Not forgetting the all important cost as well!
     
    Mr Ex Jnr likes this.
  16. richiep

    richiep
    Z Club Member

    The SteveK/pmac/Mr.F airbox was an evolution inspired by the TWM design. There were elements of the TWM that Steve and Pete felt were inferior and ripe for improvement, which led to their design.

    I assume either Mike himself or whoever he was using for the production had the moulds. I hope, once more important concerns have been addressed, that something can be done to resume manufacture somehow. The MJP airbox is a great piece with proven advantages.
     
    AliK and toopy like this.
  17. SteveK

    SteveK Forum User

    OK full story

    I built my first fuel injected engine (ver 1) back in 2004 and wanted to squeeze as much power as possible out of it in order to prove a number of people wrong (yes you know who you are) plus knock a hole in the drag challenge, in order to do that I wanted to manage air temps better (the Z engine bay gets really hot under racing conditions and hot air can contribute to detonation and reduction in power) Air boxes are nothing new, people have been putting them on engines since engines were a thing.

    Originally I bought a TWM one in 2004 and ran it for a short while , after about 3 weeks it fell apart with almost disastrous results, one of the securing buckles fell apart and an internal fastener (rivet) got sucked into the engine throwing a valve, it was at that point that I thought it was time to redesign it. I had a friend who owned a molding company and they made a mold and ran off a few which I sold. I had at least one instance where I shipped a unit to a certain individual and he didn't pay and disappeared off the scene, Pete and I did some additional work improving seals and fasteners etc and sold a few more and at that point Mike offered to take it on as he was in a better position to market and sell them on.

    We did extensive dyno testing at Dave Walkers rolling road emporium and produced some very interesting data, all of which favored the air box.
    I have tried a number of velocity stacks and found the best result was using the adjustable ones that DW sells
    When set to their shortest (around 25mm) they gave the best HP reading as it reduced the overall inlet tract length, altering the length from 25mm to 50mm didn't really alter the fueling (AF ratio) so it was a very practical solution to adjust them for the application at hand. best figure we had was around 297HP and 245ft/lbs torque with almost no torque drop at around 3500 -4000 that usually appears. Of course that's no where near what a rebello engine produces :EXTRAlol: but hey not bad for a home build.

    There were a number of threads on the forum debating it, the general consensus was if you hadn't got a clue what you were talking about then they were a bad idea, conversely if you took the time to look at the empirical evidence (reduction of torque hole, reduction of hot air, filtration)......... then they were a good option.

    In 2004 they weren't common, now the're all over the place.
    I did see one or two in some pictures of Japanese engines of the late 90's (thanks Alan) predating my efforts but could never find where to get one.
     
    SacCyclone, richiep, atomman and 3 others like this.
  18. franky

    franky Well-Known Forum User

    welcome back Steve!
     
    AliK likes this.
  19. SeanDezart

    SeanDezart Well-Known Forum User

    Hi Steve.

    My engine was dyno-ed with the variable length stacks and the tester reckoned that once the correct length had been determined, it would run better on ordinary stacks as the variables inhibit some of the intake diameter - do you see what I'm trying to say ?

    FRP automotive were making these airboxes too at £210 harware and seal included. Agreed, they work very well although I went down a different route for my own reasons.
     
  20. jonbills

    jonbills
    ZClub Administrator
    Moderator

    IMO Sean, your tester is only going to be right if the TB diameter with the trumpet is the limiting factor on air flow for the engine. With a 45mm body, its more likely the limit is elsewhere.
     
    SeanDezart likes this.

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