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  1. #1
    Join Date
    Jun 2016
    Location
    Germany
    Age
    57
    Posts
    46

    implementation of RV 4.6

    Hello,

    right now there a RV8 3.9 ltr. installed i my SUMO.
    I just bougth a 4.6 ltr engine in order to change it aganst the 3.9.
    What I recognized right now is that at least timing cover and pulleys need to get changed since they won't fit in the SUMO.
    The 4.6 should be driven by Edelbrock carb as well.

    Does anybody know what else is to consider and which parts have to be used and fit instead of the above named?

    Thanks for any advises.

    Regards
    Markus

  2. #2
    Join Date
    Nov 2012
    Location
    Lanarks
    Age
    63
    Posts
    209
    You'll need to change the camshaft and lifters in the 4.6 if you use the older style front cover similar to the SD1 type.

    The SD1 type front pulley also needs a small spacer fitted.

    The sump and oil pick-up pipe needs to match the front timing cover

    The rear of the 4.6 has a pin on the flange that needs removed or your flywheel drilled to suit.
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    Last edited by drammyboy; 11-11-19 at 11:55 AM.

  3. #3
    Join Date
    Mar 2005
    Location
    Northampton
    Posts
    1,078
    You may also need to move the alternator from the top of the block to somewhere lower down so that the bonnet will shut, and on mine the water pump fouled the chassis so a blanking plate with a pipe to feed a remote water pump was made.
    David (AKA Firestarter29)

    Lead, follow, or get out of the way.

  4. #4
    Join Date
    Nov 2012
    Location
    Lanarks
    Age
    63
    Posts
    209
    .............
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  5. #5
    Join Date
    Jun 2016
    Location
    Germany
    Age
    57
    Posts
    46
    Thank you for that first information.
    Do camshaft, lifters and timing cover from the3.9 ltr. engine fit onto the 4.6?
    Or do I eed any special parts?
    How about firing the 4.6 by a distributor?
    Will the 3.9-parts again fit?

  6. #6
    Join Date
    Nov 2012
    Location
    Lanarks
    Age
    63
    Posts
    209
    Just keep your 3.9 lifters in order when you swop over.

    I've just converted my 4.6 Gems engine over to a distributor drive with the SD1 parts.
    I think the 3.9 is the same apart from the higher up water pump but all should fit.
    Remember to fit a spacer for the 4.6 crank.
    I just cut off a piece from the old 4.6 bottom pulley and faced it off on the lathe.

    When the cam is out of the 4.6 and the front cover is off.......now is the time to drill two small 1/8" angled holes directed towards the cam gear......helps a bit with wear.

    Inspect your old camshaft for wear, especially the rear lobes. The bottom of the lifters will tell you if there is problems coming.

    A good spark and a dribble of petrol to get it fired up is better for this auld timer than all that electrickery bits and bobs that these young guns like.

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