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Thread: "HOW TO" port an engine

  1. #41
    Member vandal's Avatar
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    wish more people would share theyre engine work.i cant see what all the secrecy is for.i ported my 30.5 from cabbie's thread on HBF,very informative & well detailed.keep up the great work cab.

  2. #42

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    agreed, although tbf its his livelyhood, i mean if everyone knew how to port engines themselves i doubt the engin builders would get much buisness

  3. #43
    Contributor miniripper's Avatar
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    Engine porting aint for everyone! Just like everything else in the world some can and some would rather pay to have it.

    What Cabbie is showing you how to do here is basic stuff as you guys need to start somewhere. And you will get a marked improvement in performance.

    Where Porters earn there money is when they start adding extra intake ports and cylinder work this is what Scotty does to the MMR Pro MX head kits and engines.

    Cylinder porting – port time/area set, roof angles altered – for more efficient scavenging, port edges re chamfered leaving no sharp edges that could snag a ring or scrape the oil off the piston plus the cylinder is converted to 6 port. Intake & transfer tunnels re-surfaced to an 80 grit finish. Cylinder head modified to increase performance , squish band professionally machined to match the crown of the piston, increasing burn efficiency. Squish band set to 53% of the bore area & compression ratio set @ 15.2 : 1 (if built with the recommended clearance of 0.40mm). Piston skirt reshaped to aid flow into the transfer tunnels & reduce weight.

    Once you guys start doing this for yourself you will have much better appreciation of the skill required.

    Good luck and a great thread for all you guys who lover homers.

  4. #44
    The Doctor cabbie's Avatar
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    As Gareth said, all I'm doing here is simple gas-flow improvements.

  5. #45
    UberRC product Tester MiniJOD's Avatar
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    Quote Originally Posted by nick-c-1990 View Post
    i have a 26 cc engine 2. out of a 5t .if i did it to that would the 26 be quicker than the 29 ?
    the 26cc is probably quicker than the 29cc anyway for top speed as it is higher revving. the stock 26cc engine is great

  6. #46
    Adminicastrator Hiks's Avatar
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    Yeh the stock fuelie is a nice engine, I always thought that super reliable as well.

    The old higher revving thing goes out of the window a little though where porting is concerned, depending on said porter of course and the kind of work it has done.

  7. #47

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    Quote Originally Posted by MiniJOD View Post
    the 26cc is probably quicker than the 29cc anyway for top speed as it is higher revving. the stock 26cc engine is great
    i really don't get that y would a 26 be faster that a 29 :boxed: ?

  8. #48
    The Doctor cabbie's Avatar
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    Quote Originally Posted by nick-c-1990 View Post
    i really don't get that y would a 26 be faster that a 29 :boxed: ?
    At top speed cause the 26 will rev higher but the 29 will pull harder.

  9. #49

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    so dose that mean iv i put a 29cc head kit on a 26cc engine i will be quicker than putting a 29cc head kit on a 23cc engine . or will it be the same ? its a 26cc out ov a 5t bye the way and i have a 5b with a 29cc head kit on

  10. #50
    The Doctor cabbie's Avatar
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    OK, the crankcases are the same on all engines, it's the different crankshafts and head kits that count, as for what does what it depends on what you need in terms of power, on a short winding track you would go for a low revving torque motor, for long straights then a high revving motor would be better, the choice is your's.

  11. #51

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    is the crank or anything else different on the 26 to the 23?

  12. #52
    Senior Member
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    heres cabbies own baja with a ported engine,its a beast!

  13. #53
    Member chezzy71's Avatar
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    that does look quick.. what size engine is that...?

  14. #54
    Administrator Nifts's Avatar
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    Nice!!! very nice sounds peachy, picks up nice

  15. #55

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    but what is it a 29.or26. ???.....

  16. #56
    The Doctor cabbie's Avatar
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    Thats got a Trevor Simpson reed motor with +1mm stuffed crank and 29cc ported head.

  17. #57

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    did you port that one yourself cabbie

  18. #58
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    I had a cabbie motor once ... Then it got dyno'd and i no longer had a cabbie motor

  19. #59
    The Doctor cabbie's Avatar
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    Quote Originally Posted by nick-c-1990 View Post
    did you port that one yourself cabbie
    Yes mate, here it is

  20. #60
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    Brings back memories that pic cab..


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