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matt_lamb_160

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Everything posted by matt_lamb_160

  1. matt_lamb_160

    crossflow porting results

    Do you think guide shaping has much of an influence under 0.5"-0.55" lift? Do you recon you'd get 200cfm without it? This is interesting for high k engines with modest lift cams and turbo builds. Good work again. You have shown real evidence that you are searching for what makes the biggest difference and not just opening every up and saying "it must work, the car does 12s". Restricted classes of racing are best for separating who knows and who doesn't. Keep showing your efforts and I think it will pay off.
  2. matt_lamb_160

    Wastegate positioning

    Thanks mate. Now thinking of having a mild steel piece of pipe in between to position the wastegate to where I want it. Will try Nicore 55 rods to joint cast to mild and Weldalls (because we have them) for mild to s/steel.
  3. matt_lamb_160

    crossflow porting results

    Great work mate. Does the port work include opening the throats, I assume it does otherwise the low lift improvements are surprising. I had convinced myself that when using a cam with 0.45" lift port work other than in the bowl area would be pointless as the heads would not be port limited at that point (they would be valve limited). An even more progressive test which showed the influence of valve guide shaping alone would be interesting.
  4. matt_lamb_160

    Wastegate positioning

    Yep, it was much less than that when offered to me.
  5. matt_lamb_160

    Wastegate positioning

    No doubt it would "work" as the top of the collector is open, but I could see that it was less than ideal and was after ideas on how to fix it which I have received. The cast welding is not a major issue, I can use cast steam pipe and Ni rods (pre-heat does not need to be super hot), but then welding my s/steel v-band flange to cast I am not sure? Some have suggested "buttering" the cast with Ni and then welding the s/steel to the Ni??? A good manifold that already had a v-band flange to suit a 44mm Tial wasgate would be nice .
  6. matt_lamb_160

    Wastegate positioning

    Yes Wes has given good advice, but I think you should have a look at some of the work done by the guy suggesting the turbine housing option before yoy call him a liar. I am confident he has done it before. I think his advice is also good. The cracking issues were pointed out by Wes. Thanks for your input.
  7. matt_lamb_160

    Crossflow alloy head casting numbers

    The odd one looks like a milled C2 to me.
  8. If your disks are rattling you may want to check your wheel bearings.
  9. matt_lamb_160

    Crossflow alloy head casting numbers

    Pictures would be good.
  10. matt_lamb_160

    Crossflow alloy head casting numbers

    What Ando has said sounds right to me. I have C2 heads at 42cc, C1 heads at 49-50, E1 at 57cc and E2 at 50cc. These numbers may not be exact, but E1 and E2 heads I am sure are very different.
  11. matt_lamb_160

    Crossflow alloy head casting numbers

    E2 is still pretty high comp ~50cc. It is similar to C1. E1 heads are low comp ~57cc. Correct me if I am wrong, but I am reasonably confident.
  12. matt_lamb_160

    Wastegate positioning

    Thanks everbody for your input, I think there have been some good ideas put forward. I think the wastegate off the turbine housing is something good for me to consider no matter what manifold I use (assuming it doesn't already have a well positioned wastegate outlet), especially any manifold designed for internal gate turbos. If there are anymore ideas on wastegate positioning, don't really even need to relate to this manifold, I would like to hear them.
  13. matt_lamb_160

    Wastegate positioning

    Sorry, missed this the first time, you mean kind of like on this housing: http://www.atpturbo.com/mm5/merchant.mvc?Screen=PROD&Product_Code=ATP-HSG-043&Category_Code=HSG
  14. matt_lamb_160

    Wastegate positioning

    The manifold is not divided all the way to the flange, the second photo is bit deceiving. It is just a short 'merge collector'.
  15. matt_lamb_160

    Wastegate positioning

    That is a good idea but it is low mount and I think I would run out of clearance on the shock tower.
  16. matt_lamb_160

    Wastegate positioning

    Thanks Wes, that's pretty much exactly what I thought, another outlet in the same spot but on the opposite side and join them together before the gate. I can get a manifold like it pretty cheap, trying to decide if it is worth it.
  17. matt_lamb_160

    comp ratio to suit camshaft

    Will do. Thanks mate.
  18. matt_lamb_160

    comp ratio to suit camshaft

    Yep. Did you think you could hide forever?
  19. matt_lamb_160

    comp ratio to suit camshaft

    I think low tens would be pretty safe assuming you are using petrol. But mid to high 9s would be fine. The cam will pull from 2200rpm up to 5,000ish I think, but lift is low for duration.
  20. matt_lamb_160

    Digital boost controller/GM map sensor

    It probably will not be an issue. It is not hooked up yet.
  21. Can anyone recommend a good but basic digital boost controller that uses an external GM map sensor?
  22. matt_lamb_160

    HP Limits

    What would the HP limits of this LPG setup be: Old single outlet tank (no lock off at the tank) Twin 1/4" (pretty sure, but have not measured) copper lines running from a tee piece at the tank to two separate electric lock offs under the bonnet. Each lock off is connected to a model L Impco.
  23. matt_lamb_160

    HP Limits

    One per converter. The line is split in the engine bay for two converters and each converter has its own lockoff.
  24. matt_lamb_160

    HP Limits

    Somehow I have forgotten about this thread. I was asking for my turbo'ed 250. I am now running 3/8 flex line (one) and two electric lockoffs in the enginebay. The fitting in the tank has a ~5/16" minor diameter (much bigger than any lockoff), but I do not know if there is any internal restriction behind that. I am looking for 200-230rwkw, no more.
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