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  • Users: Knap
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  1. Knap

    pressure limits on synth oil

    Oils and STP results from VOAs are updated on this site http://www.lnengineering.com/oil.html Follow up article from MG owners indicates that it is still not an issue in UK (SL oils)Penrite also released a tech bulletin warning about the use of SM oils with flat tappets...
  2. Knap

    Is a lighter car always better for cornering?

    Extract from an excellent book on tyre grip and covers effect on wet road http://www.insideracingtechnology.com/tirebkexerpt1.htm
  3. Knap

    front RC lower or higher than rear?

    The equations we use in the WTW (since 1999) are the same as used by Claude Rouelle. Geometric Weight Transfer - due to the component of lateral force, applied directly at the Roll Centre (RC). Geometric WT is reacted directly through the suspension linkages, and does not induce body roll. It...
  4. Knap

    Is a lighter car always better for cornering?

    Any help http://www.autozine.org/technical_school/handling/tech_handling_3.htm
  5. Knap

    pressure limits on synth oil

    The concern appears to be over ZDDP rather than base oil http://www.joegibbsracingoil.com/datasheets/81106.php Amsoil have a tech bulletin on flat tappets http://www.amsoil.com/dealer/techservicesbulletin/TSB_flat_tappet_and_camshaft_lube.pdf These types of oils are a PAO ester mix, however with...
  6. Knap

    Too Cold Oil Temperature??

    Would low oil temperature be an issue re cavitation and additives not being as effective, as well as not maximising power output?
  7. Knap

    Hi Octane fuel in regular engines

    BP sell 102 near UK race tracks for the track day enthusiast 60bhp increase claim http://www.bp.com/sectiongenericarticle.do?categoryId=9009114&contentId=7016932
  8. Knap

    Chevy V8 performance and wear vs. coolant/oil temperature.

    CentralCoaster This is old http://www.carnut.com/ramblin/_cool3.html I believe Vizard recommended lower temp for more power but again many years ago. From Internal Combustion Engine Handbook The important factor regarding operational life and reliability is the component temperature. The...
  9. Knap

    Why 56.6mph?

    Rod Was the Lotus Cortina sold in US?
  10. Knap

    Hi Octane fuel in regular engines

    Rod This statement An additional advantage is that, due to their different composition, "premium" fuels are typically two or three percent more dense than "normal" fuel, which means that each litre contains two or three percent more mass of fuel, and hence two or three percent more energy...
  11. Knap

    Pre-Ignition vs. Detonation

    7.7 What is the effect of engine deposits? A new engine may only require a fuel of 6-9 octane numbers lower than the same engine after 25,000 km. This Octane Requirement Increase (ORI) is due to the formation of a mixture of organic and inorganic deposits resulting from both the fuel and the...
  12. Knap

    Why 56.6mph?

    A current recommendation for UK motorways is 78mph, not that it will be changed from 70mph. During the 1973 fuel crisis when rationing was almost introduced, the UK Government recommended 56mph for most economical motorway speed.
  13. Knap

    Hi Octane fuel in regular engines

    Rod I'm not convinced by that statement. An original test when Optimax 98 arrived in UK (now Vpower 99)showed no improvement for a Clio http://fifthgear.five.tv/jsp/5gmain.jsp?lnk=601&featureid=143&pageid=273 Conventionally, enrichment for maximum power air/fuel ratio is used during full...
  14. Knap

    Pre-Ignition vs. Detonation

    We should note that even cars designed to run on regular fuel might require higher octane as they age. Carbon buildup inside the cylinder can create hot spots that can initiate knock. So can malfunctioning exhaust-gas-recirculation systems that raise cylinder temperatures. Hot temperatures and...
  15. Knap

    Hi Octane fuel in regular engines

    I understand that fuels sold in UK except Shell Optimax (V power) Tesco 99 (Ethanol) and perhaps BP Ultimate (noticed run on using this), are basically and often literally, exactly the same base product in to which each company puts in their own additive package. i.e you will see all kinds of...
  16. Knap

    Hi Octane fuel in regular engines

    I thought Toluene had more energy but ethanol less.
  17. Knap

    Hi Octane fuel in regular engines

    UK testing http://www.thorneymotorsport.co.uk/gcs_article.php?artid=64&typelink=http%3A%2F%2Fwww.thorneymotorsport.co.uk%2Fgcs_article.php%3Ftype%3DNews%26subtitle%3D0%26title%3D0%26text%3D0%26toc%3D1 may not apply to regular engines and may only benefit certain engines My understanding with...
  18. Knap

    Anti-Freeze Question

    non-aqueous propylene glycol http://www.evanscooling.com/main21.htm Alternative to WW http://www.thethirsks.co.uk/motormax/racing.php
  19. Knap

    proper exhaust dimeter

    Pat I only recently spotted this post on another forum, and have not yet had chance to ask the author any questions, so did not wish to take any part out of context, however it did refer to tailpipe. The total length of the Collector and Tailpipe (to the front of the silencer) sould be equal...
  20. Knap

    proper exhaust dimeter

    Rod You may be inyerested or wish to comment on the following written by a fellow MG owner Exhaust tuning theory is actually fairly simple, it’s all about getting the negative (and, hence, scavenging) pressure pulse to arrive at the exhaust valve as it is opening. To do this we have to set the...

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