Posted: Mon Feb 04, 2008 7:24 pm
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RV8 4.6 tuning a build advice required
Page 2 of 2
Posted: Mon Feb 04, 2008 9:24 pm
Hi Guys,
Thanks for posting the pic.
I've got a bit more info about my block from RPI (Holley seems to know everything about RV8's).
He is sure that the short motor was built by Power Train Products and that they always cut "eye browse" into their pistons as their motors ended up in TVR's and Morgans that ran with hi-lift cams. I'm sure that the pistons did not fly apart in those motors so mine should be fine.
A nice bonus is that they balance their engines to a finer tolerance than Rover ever bothered to do.
Pete
Thanks for posting the pic.
I've got a bit more info about my block from RPI (Holley seems to know everything about RV8's).
He is sure that the short motor was built by Power Train Products and that they always cut "eye browse" into their pistons as their motors ended up in TVR's and Morgans that ran with hi-lift cams. I'm sure that the pistons did not fly apart in those motors so mine should be fine.
A nice bonus is that they balance their engines to a finer tolerance than Rover ever bothered to do.
Pete
Posted: Mon Feb 04, 2008 10:04 pm
Hi Pete,
Glad to hear all the good info on your short. You must be pleased!
That also explains why your block has no engine number.
All the best,
Ron.
Glad to hear all the good info on your short. You must be pleased!
That also explains why your block has no engine number.
All the best,
Ron.
Posted: Tue Feb 05, 2008 9:25 am
You could try to locate a set of 4,0 litre pistons. They have a smaller dish and you could raise the CR. Skimming the block is not exactly cheap. I believe someone had a set of 4,9 litre internals for sale just a short while ago.
I cut valve reliefs to my 4,6 litre pistons and have not found any problems. Latest Rover pistons are quite nice design and seem pretty strong.
I cut valve reliefs to my 4,6 litre pistons and have not found any problems. Latest Rover pistons are quite nice design and seem pretty strong.
Posted: Tue Feb 05, 2008 10:50 am
Thanks for you help guys.
I think that I'll stick with the pistons that I've got as I now know where they came from (Power Train Products). These guys supplied blocks for TVR so I guess that they will be OK for me!
I will get 40 thou skimmed off the heads (which will make 80 in total!).
This will cost me 80 quid but should get the compression up round 9.75-10:1 (If i've used my burette correctly!)
Cheers,
Pete
I think that I'll stick with the pistons that I've got as I now know where they came from (Power Train Products). These guys supplied blocks for TVR so I guess that they will be OK for me!
I will get 40 thou skimmed off the heads (which will make 80 in total!).
This will cost me 80 quid but should get the compression up round 9.75-10:1 (If i've used my burette correctly!)
Cheers,
Pete
Posted: Wed Feb 06, 2008 3:05 pm
What does the CR increase to when fitting the 4.0L pistons in a standard 4.6L 9.35CR engine.minorv8 wrote:You could try to locate a set of 4,0 litre pistons. They have a smaller dish and you could raise the CR. Skimming the block is not exactly cheap. I believe someone had a set of 4,9 litre internals for sale just a short while ago.
I cut valve reliefs to my 4,6 litre pistons and have not found any problems. Latest Rover pistons are quite nice design and seem pretty strong.
Posted: Wed Feb 06, 2008 3:23 pm
10.6:1
Straight swap for the 4.6 pistons.
Russ
Straight swap for the 4.6 pistons.
Russ