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Recent content by womble

  1. womble

    Gerotor and gear oil pump formulea

    I have both pumps. I'll try and rig up a testing device with them. Thanks for the ideas. Regards
  2. womble

    Gerotor and gear oil pump formulea

    Hi, I'm looking for any books or papers that have formulea to calculate flowrates for gear and gerotor oil pump designs. I have run a search on here but that only lead to dead ends. I've searched the SAE database too but the abstracts have not given me much detail and I don't wan't to waste my...
  3. womble

    Unable to find answer to plenum question despite search...

    Granted you can go to the nth degree in design detail... But for DIY I don't think it's that hard. If you go for a front entrance plenum design that has the volume you require, tapering down to a minimum height above #4 runner (1.5xrunner_id minimum)you should get very good runner to runner...
  4. womble

    Unable to find answer to plenum question despite search...

    I re-read this thread when I got home last night and I see you ment a different type of manifold than the "swedish" style I thought you ment i.e. WRC/Rallycross style. When I wrote the first post I was unable to see your pictures due to our internet restrictions. The manifold without the taper...
  5. womble

    Unable to find answer to plenum question despite search...

    "I am looking at having a new one made and would like ot know what factors determine the Taper rate from front to rear???" Only fabrication issues. There is nothing really complicated about it. It's just a form of a slot distribution pipe as used in some process industries. It just allows an...
  6. womble

    Burn pattern opinions

    I've just been looking at an SAE paper(#950680) on combustion chamber deposits. According to the paper, brown and lighter areas are the coldest (and thinnest deposits), black areas are hot and black "caked" areas (looking like a dry river bed) are the hottest (and thickest deposits) areas in the...
  7. womble

    Turbine Efficiency - Garrett Turbocharger

    I think you may need to also consider exhaust manifold and exhaust outlet design if stepping up to the larger frame turbo so you can spool it up and keep a decent power band. You could consider the following: 1. Going to a divided turbine housing (if offered) and use a pulse manifold, keeping...
  8. womble

    Rod Ends and Spherical Bearings

    Most of my components have been for my own Track Day car. I have done work for other people but my daytime job prevents any serious work in this respect. Good website you linked to :-) Prices don't seem too bad... Stef
  9. womble

    Rod Ends and Spherical Bearings

    Hi Guys, I currently use NRE rod ends and spherical bearings for some fabricated suspension parts I design/make. I've had no real issues with them but I was wondering what manufacturers other race car builders use. So, who's your favourite supplier? What bearing types do you use and why? Have...
  10. womble

    Books of engine component dimensioning and tolerancing

    The engine type is around twenty years old at the most... The pistons and rods I've leave to the manufacturers after reading a bit more about them. As for the valve guides... Well they are cast iron as stock but of course we want them in bronze. However, I've found a supplier for valves and...
  11. womble

    Books of engine component dimensioning and tolerancing

    Thanks for your help guys. The specific problem I have is with an engine that has minimal aftermarket support. We reached the limits of some of the stock parts and have been modifing components from other engines to work with ours. I no longer wish to do this and would like to develop parts...
  12. womble

    Books of engine component dimensioning and tolerancing

    My main worry is over doing the tolerancing on the part and it becomes too expensive to produce or impractical. I suppose I want to know whats acceptable within the industry. If any one has any examples please post a URL. Thanks again
  13. womble

    Books of engine component dimensioning and tolerancing

    It's the more specialised features really, like the ones you've mentioned or as an example, say a connnecting rod; How much tolerance for twist, flatness, distance between centres, etc. is allowed? Are there any industry or company "standards" for tolerancing certain items? I hope people don't...
  14. womble

    Books of engine component dimensioning and tolerancing

    Hi All, I was wondering if there was any information available on dimensioning and tolerancing practices for engine components (gasoline engines)? I need some custom parts made for an engine. I could just leave the tolerancing up to the machine shop but I like to keep detailed records of...
  15. womble

    Strut Top Mount Serration Fastener

    Thanks Cory. I'll contact a couple of manufacturers. As it's a low volume product, I may end up having to use a different solution. Thanks again, Stef
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