Engine Overhauling - Cam replacement

Discussion in 'Rocket Performance' started by Scholle, Mar 13, 2019.

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  1. Scholle

    Scholle Never say never

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    My 05 Rocket did not run clean after 240,000 km. The engine no longer cleanly picked up gas in the upper engine speed range, cylinders 2 and 3 had a lower compression than the 1st cylinder.
    So I had the engine removed and disassembled. Although the
    fault was with the defective cylinder head gasket, I had decided because of the
    high mileage of the engine to a complete overhaul. It turned out that all
    components were still in perfect condition. Nevertheless, I had decided to
    improve the performance a bit.
    Therefore, I bought 3 new pistons from JE with a compression
    ratio of 10.5: 1, completely renewed the cylinder head, used new valves and
    valve guides and had the crankshaft incl. balance shaft and flywheel balanced.
    Finally, the engine should run for another 10 years without problems.

    After reading a posting by Ulf Penner elsewhere in this forum Mild tuning cam who said, replacing the stock intake camshaft by a stock exhaust camshaft would be an economical way to increase performance slightly. So I got myself an extra exhaust cam and am now faced with the question as to which position/lobe center this camshaft should be optimally installed.

    First and foremost, I am not so much interested in increasing the performance in the upper engine speed range, but in low and mid end torque and power.

    My idea is, that a longer overlap (slightly earlier opening and later closing) will give more time to support the high compression pistons to make their job.

    Should the camshaft be built in 1:1 as the stock intake cam or installed offset by one or even several teeth?

    Does anyone of you have any idea about this? I am thankful for every hint.

    Georg
     
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  2. barbagris

    barbagris Mad Scientist

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    Georg - call Ulf @Penner - He knows for sure, and what's more close to home.
     
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  3. Scholle

    Scholle Never say never

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    I tried to contact Ulf Penner several times by email, asking him for advice, but never got any reaction….
    Georg
     
  4. R-III-R Turbo

    R-III-R Turbo Warp Speed: ENGAGE

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    Just sent him a message there, hopefully he will be along shortly
     
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  5. Scholle

    Scholle Never say never

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    I guess that Ulf Penner isn´t so much convinced of his idea anymore. Especially as obviously nobody has already tried to do it. But maybe he will answer my question in this thread...
    Georg
     
  6. Bernard Vinet

    Bernard Vinet Frenchbernie

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    If your bike has 240 thousand km. I would consider installing new Injectors . After all they have worked just as hard & often as your pistons. just a thought.
     
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  7. Scholle

    Scholle Never say never

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    Same idea as I had:). I let them check and clean professionally. The injectors and their injection values are perfect right now.
    Georg
     
  8. idk

    idk Living Legend

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    You may want to consider getting cams from a bloke in a tin shed.
     
  9. Scholle

    Scholle Never say never

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    I already got a stock ex-cam and would like to try if it works fine. I don´t want to spent much money in custom cams, as those cams will mainly improve performance at higher revs. I spend a lot of time in travelling around Europe (from the Northcap in Norway to Gibraltar in the south, from Istanbul to Ireland and so on...). Most of these countries have a strict speed limit:evil:. There is no need for power at high revs...
    Georg
     
  10. idk

    idk Living Legend

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    Tell him where you want the power and he will make cams to suit your needs.
     
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