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

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ag1234
Arthur Gertz

(66 posts)

Registered:
03/29/2023 08:26PM

Main British Car:


Alternative RV8 pistons ?
Posted by: ag1234
Date: February 17, 2024 01:33PM

Perhaps not original RV8 pistons ? Perhaps some Toyota 3.7" bore, V8 ?
Onward, Art.


RDMG
Dave R
Northern Virginia
(138 posts)

Registered:
04/07/2016 08:29PM

Main British Car:
1979 MGB 4.6L Rover V8

Re: Alternative RV8 pistons ?
Posted by: RDMG
Date: February 27, 2024 02:26PM

I found Toyota pistons for the 2rz-fe 4-cylinder engine from early 1990s Tacomas. they’re a decent option if you’re using a larger combustion chamber head like Buick 300.

3.74” (95mm) diameter, 24mm pins (same as RV8). NPR makes a set of 4 for $80-ish, you can buy off-brands on eBay for less.

I have a set of 8 oversize pistons (95.5mm I think) if you want them.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6469 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Alternative RV8 pistons ?
Posted by: BlownMGB-V8
Date: February 28, 2024 10:34AM

Cast?
Compression height?
Dish?


MGBV8
Carl Floyd
Kingsport, TN
(4512 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: Alternative RV8 pistons ?
Posted by: MGBV8
Date: February 28, 2024 11:56AM

Toyota 2RZ-FE? That engine was in production from 1995-2004 for the Tacoma.

Wiseco Forged Pistons Toyota Tacoma 95-03 95mm STD 2RZFE 8.8:1 -10cc K642M95

Compression Height 1.398" / 35.5mm

Dave R brought up using Toyota pistons back in 2018.

[forum.britishv8.org]


mgb260
Jim Nichols
Sequim,WA
(2463 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Alternative RV8 pistons ?
Posted by: mgb260
Date: February 28, 2024 12:10PM

Not zero deck, with that small dish, probably .030-.040 down. The stock size is .040 over Rover 4.0/4.6. Very inexpensive. I think Dave had 10 to 1 with the 300 heads.



Edited 1 time(s). Last edit at 02/28/2024 04:11PM by mgb260.


RDMG
Dave R
Northern Virginia
(138 posts)

Registered:
04/07/2016 08:29PM

Main British Car:
1979 MGB 4.6L Rover V8

Re: Alternative RV8 pistons ?
Posted by: RDMG
Date: February 29, 2024 09:00PM

Hard to believe it’s been 6(!) years!

The Covid pandemic didn’t do my project any favors. I have an RV8 block with the low-cost Chevy 305 top hat liners pressed in but not bored/honed, a set of tricked out 300 aluminum heads with oversized ferrea valves and z28 springs, a 4bbl 215 intake, a “fast road” 215 cam, an early Land Rover oil pan, and a few different front covers. Also a 4.6L rv8 crank, an aluminum flywheel, the Toyota pistons, and some lightweight piston pins. Sadly, they’re all collecting dust.

I am in desperate need of a machine shop to bore/hone/deck the block and dynamically balance the rotating mass, but that’s another topic…

I’ll dig up the specs I found for the factory 2rz-fe pistons, if I recall, the comp height was the same as the wiseco pistons above, but the dish was a bit smaller. From what I saw on the web, the Toyota guys like to turbo/supercharge their engines, and the stock 2rz pistons hold up pretty well when they do.

I’m reasonably confident that the piston/heads combo will work, but it seems every commercial machinist within 100 miles of me thinks I have two heads…


ag1234
Arthur Gertz

(66 posts)

Registered:
03/29/2023 08:26PM

Main British Car:


Re: Alternative RV8 pistons ?
Posted by: ag1234
Date: March 01, 2024 09:51AM

Dave, I believe the 215 intake manifold will be a restriction to those 300 heads. Though not the best design, the Offy single-plane will port easy to match the 300 heads.
Good Luck, Art.



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