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  1. sierra4000

    Racing oil for historic engine

    Yes, is "flat-tappet lifters and very high valve spring pressures" Ford Cologne V6, 2,8 engine, for circuit racing. Idea is https://www.burtonpower.com/millers-engine-oil-css-20w60-semi-synthetic-5-ltr-mil6254g.html?srsltid=AfmBOooj0DrXUdMJKbqXQWOof-qVYP2j__NNF_fBTl_7ZWuN80qx4Ugi Casrtol is...
  2. sierra4000

    Racing oil for historic engine

    What is recommendation for historic racing engine oil? Now is brake-in oil 10w40 cold on idle 6bar, 80C hot oil 4bar on idle (1500RPM) Thank You for tips and recommendations Radek
  3. sierra4000

    Fine Dyno tuning

    Another idea is to insert a spacer for split intake note: lambda measurement is the basis
  4. sierra4000

    Quench dimension

    Thanks, so new size 1,1mm with steel rods, with cast pistons , redline 7000rpm is in safe range, Radek
  5. sierra4000

    Fine Dyno tuning

    Compression ratio is around 11.5 310 degree camshaft ported heads open/ optimized exhaust by computer program I saw gains (peak HP) with 100 octane fuel from a different brand I saw gains (area under the TQ curve) with just a change (reduction) in the diameter of the exhaust end and you see...
  6. sierra4000

    Fine Dyno tuning

    Hello, Exist some old tricks - recommendations for quick changes during fine dyno tuning to maximize power ?? (racing old style engine) for example: different fuel carb. height change (differet spacer) antireverse plate exhaust tailpipe diameter change etc etc Thanks for any tips Radek
  7. sierra4000

    Quench dimension

    So, is mainly mechanical problem to maintan head/piston in safe without mutual contact? Yes , this area is quite short Original dimension is 1.4mm head gasket+0.4mm piston top under block face now block is milled -0,7mm new area dimension 1,1mm
  8. sierra4000

    Throttle body dimension

    Original engine 150Hp/5700 rpm with Throttle body 55mm
  9. sierra4000

    Throttle body dimension

    Sorry What is MFG? Original is 54mm, seems undersized. Original engine had 150 hp.
  10. sierra4000

    Throttle body dimension

    Rally, MFI - KJetronic
  11. sierra4000

    Throttle body dimension

    Hi, what is Throttle body diemeter requirement for V6 engine? 2800 ccm 200hp target 7000RPM Thank You for ideas Radek
  12. sierra4000

    Intake runner surface

    So can we say that the quality of the surface affects the flow velocity? High RPM port capacity?
  13. sierra4000

    Intake runner surface

    Clarification if the intake runner is roughened along its entire length, can I expect any gain? Thanks Radek
  14. sierra4000

    Intake runner surface

    Hello, How way intake runner surface affects flow numbers and power results? (two same runner volume with different surface) (rough vs smooth) Thank You Radek
  15. sierra4000

    Quench dimension

    I'm aware of all the mechanical reasons, but from a combustion efficiency perspective?
  16. sierra4000

    Quench dimension

    V6 engine bore 94, stroke 68 mm, redline 7000 rpm, original steel connecting rods, forged pistons, 100 octane fuel, we want to get some compression ratio with block milling but keep safe piston to head distance.
  17. sierra4000

    Quench dimension

    Hello, What is minimum (ideal) Quench dimension for flat-top pistons? Piston to head distance for racing engine. Thanks Radek
  18. sierra4000

    asymmetry of the wheel alignment problems

    Thank You, I'm will trying to be more specific, toe setting recommendation is +1mm per left wheel, +1mm per right wheel (+2mm total) If is +2mm left and 0mm right wheel I know about steering wheel position change, but exist difference in tire wear and car stability?
  19. sierra4000

    asymmetry of the wheel alignment problems

    Hello , How way the asymmetry of the toe alignment (thrust angle) affects tire wear and car stability? Thank you Radek
  20. sierra4000

    Porsche 718 Cayman GTS bumpsteer on a factory SPASM setup problem..any idea where to look ?

    I noticed something similar with a series of offroad vehicles with oversized wheels (low ET big width,big diameter,big unsprung) Radek

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