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  1. #1
    Join Date
    Jun 2016
    Location
    Germany
    Age
    56
    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
    154
    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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    • File Type: jpg 4.JPG (113.3 KB, 33 views)
    • File Type: jpg 9.JPG (120.8 KB, 34 views)
    Last edited by drammyboy; 11-11-19 at 11:55 AM.

  3. #3
    Join Date
    Mar 2005
    Location
    Northampton
    Posts
    1,071
    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
    154
    .............
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  5. #5
    Join Date
    Jun 2016
    Location
    Germany
    Age
    56
    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
    154
    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.

  7. #7
    Join Date
    Jun 2016
    Location
    Germany
    Age
    56
    Posts
    46
    Hi,
    could you explain the angled holes at the cam gear? (Position and why does it help withwear?)
    I also got an information that the crankshaft need to be shortened a the front end.
    Anybody aware of that and knows the dimension to be shortened?
    Cam will anyway become a new one. Any recommendation for a reasonable cam fo the 4.6 with stage 3 valves for sporty street use?

    By the way, I am with you. So less electricity and electronics, so less problems you have.

  8. #8
    Join Date
    Nov 2012
    Location
    Lanarks
    Age
    63
    Posts
    154
    Photo from the web should explain the position of the holes - helping the front end parts stay cool

    If you are rebuilding the engine then why not up the compression.
    I think your 3.9 pistons might be the same as the 4.0 Gems (not too sure as I have never had a 3.9).....these can be put on the 4.6 rods.
    and
    improve the oiling in the block by enlarging the oil feed passage to the SD1 front cover and matching the gaskets area. A small hole in the oil pump idler gear can be done.
    Cheap and easy

    I remove the flash lines on the rods and match their weights on her indoors wee scales.
    Once again cheap.....but not so easy if SHE is about.
    I always lighten my flywheels.....see my autocad drawing in the photo
    Why have all that mass revolving in a light car.

    The heads can be deburred easily enough to open up the ports and why not smooth out the valley area to aid oil return towards those lifters.

    All this information can be found on the net....I read about it in magazines before google

    Little things that you can do at home without ever reaching into your pocket.
    OK - I had to buy the long drill and selection of burrs many moons ago.

    You can always buy buy buy performance but the fun for me is doing it yourself.
    Heck 70mph in a Rover is the same as 70mph in a bigblock
    I don't need to spin wheels at my age.
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  9. #9
    Join Date
    Nov 2012
    Location
    Lanarks
    Age
    63
    Posts
    154
    Here you go Markus
    Last edited by drammyboy; 16-11-19 at 04:34 PM.

  10. #10
    Join Date
    Jun 2016
    Location
    Germany
    Age
    56
    Posts
    46
    Thank you so much

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