Engine and Transmission Tech

tips, technology, tools and techniques related to vehicle driveline components

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mgb260
Jim Nichols
Sequim,WA
(1973 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Toyota 2.7L Pistons in a 4.8L RV8?
Posted by: mgb260
Date: August 06, 2019 08:23PM

Bump for Dave. How's the project coming?


RDMG
Dave R
Northern Virginia
(118 posts)

Registered:
04/07/2016 08:29PM

Main British Car:
1979 MGB 4.6L Rover V8

Re: Toyota 2.7L Pistons in a 4.8L RV8?
Posted by: RDMG
Date: August 11, 2019 08:50PM

Slowly but surely.

My block is at the machine shop along with the Toyota pistons and Melling sleeves. I need to check on progress.

In my research of all top hat liner options for the RV8, I learned that the Melling liner for the GM modular engines that Fred found are actually very slightly smaller OD than the “oversized” liner from Turner Engineering in the UK. As many have noted, either one is a metaphorical Dixie cup. The Toyota pistons are a bit smaller diameter than Chevy 305s, so I should have a bit of sleeve meat left.

The block may be (will be) a bit delicate, so I decided I would not go for max HP effort. That made the limitations of cast pistons (not forged) and 300 heads (not TA heads) easier to accept.

I just got my 300 heads back from Jon Carls Engineering, with oversized Ferrea valves, hardened seats, and Z28 springs. I may have over-invested in the heads (was about $1300 labor plus parts and shipping), but I’ve read in several places that the best performance investment in the BOPRV8 is the heads, so hopefully not.

My oil pump and front cover remains an open question. I really want the crank-driven oil pump, which puts me into fabrication territory (either mod the cover or the MG steering rack)

My other open question is the cam. I’ve watched the “B Cam” video at least six times, but still haven’t found inspiration.

With about 4.75L displacement, ported 300 heads, a Buick 215 4bbl intake, and coated headers with 1.5” primaries, what sort of “fast road” cam should I look for? The valve springs limit to a 6000 rpm redline, with .500 lift. The cast pistons might drop the redline closer to 5500. The block sleeves might limit the redline by another 4000. :)

I welcome any ideas or opinions relating to cam choices?



Edited 1 time(s). Last edit at 08/11/2019 08:52PM by RDMG.


mgb260
Jim Nichols
Sequim,WA
(1973 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Toyota 2.7L Pistons in a 4.8L RV8?
Posted by: mgb260
Date: August 11, 2019 10:55PM

Dave, I usually recommend Crower cams but after Bruce Crower passed away their prices have gone up almost double. I'd call Woody and ask about his Erson cams. Are you using a carb or newer TBI? Holley makes a 465cfm 4 barrel for a 289 that would be good or Summit has their 500cfm. Just something different than the usual Edelbrock. Quick Fuel has a nice 450cfm for a little more money. Have you looked at the bottom half 3800 for crank driven oil pump/top half 3.8 Buick with distributor idea.

[www.thewedgeshop.com]

[turbobuick.com]



Edited 2 time(s). Last edit at 08/11/2019 11:10PM by mgb260.


40indianss
don foote

(53 posts)

Registered:
08/01/2013 04:35PM

Main British Car:


Re: Toyota 2.7L Pistons in a 4.8L RV8?
Posted by: 40indianss
Date: August 15, 2019 10:07PM

Here is my gerotor oil pump with distributor front cover on my 4.6 before install in car
DSC00795.JPG
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DSC00828.JPG
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