Engine and Transmission Tech

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

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chasej318
chase johnson

(1 posts)

Registered:
04/23/2011 12:39AM

Main British Car:
question about the 4.0 v8 in Land Rover Disco series 1
Posted by: chasej318
Date: April 23, 2011 12:44AM

is there any interchangeability with buick v8 parts like if i went out to buy a cam and lifter kit from summit and any clear way for all interchangeability as far as stroking it , it has an auto tranny and idk if it would hold up to a few more horsies


Jerminator96
Jeremy Kamberger

(23 posts)

Registered:
11/13/2010 05:23PM

Main British Car:
Re: question about the 4.0 v8 in Land Rover Disco series 1
Posted by: Jerminator96
Date: April 23, 2011 09:49AM

Yes and no. The 4.0 doesn't have a distributor, so there are some camshaft differences. Most people use the Buick 300 crankshaft to stroke them, it has a 3.4" stroke. If you want to keep the crank driven oil pump you can offset grind the 4.6 crank to 3.4".


castlesid
Kevin Jackson
Sidcup UK
(361 posts)

Registered:
11/18/2007 10:38AM

Main British Car:
1975 MGB GT Rover V8 4.35L

Re: question about the 4.0 v8 in Land Rover Disco series 1
Posted by: castlesid
Date: April 26, 2011 06:37AM

The cam also needs to be machined for the cam retaining plate of the later engines.

You can also stretch the 4.0 engine to 4.6 by using a 4.6 crank and rods and possibly retain the 4.0 pistons smaller 13cc bowls) for a hike in compression.

kevin.
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Jerminator96
Jeremy Kamberger

(23 posts)

Registered:
11/13/2010 05:23PM

Main British Car:
Re: question about the 4.0 v8 in Land Rover Disco series 1
Posted by: Jerminator96
Date: April 26, 2011 11:31AM

I think you're right about the pistons, the 4.0 rod length is 6.1", where the 4.6 is 5.9"...so that should work out to the same compression height.


Robidunno
Robert Clapp

(2 posts)

Registered:
06/16/2011 12:00AM

Main British Car:
Re: question about the 4.0 v8 in Land Rover Disco series 1
Posted by: Robidunno
Date: June 16, 2011 12:03AM

I was told that the 4.6 pistons were offset on the rods compared to the 4.0, is that correct?



Edited 1 time(s). Last edit at 06/16/2011 11:13PM by Robidunno.


castlesid
Kevin Jackson
Sidcup UK
(361 posts)

Registered:
11/18/2007 10:38AM

Main British Car:
1975 MGB GT Rover V8 4.35L

Re: question about the 4.0 v8 in Land Rover Disco series 1
Posted by: castlesid
Date: June 16, 2011 08:21AM

Jeremy,

Both the 4.0 and 4.6 have a small offset so no problem to a straight swap of parts to achieve 4.6 which is actually 4552cc.

If and when you have the engine apart do check carefully for signs of liner movement as the 4.0 blocks are the most prone to this problem, the 4.6 engines were built up from blocks with less casting core movement, just check all liners are sitting at the same height..

You should be able to find a scrapped 4.6 1/2 engine that has had a cracked block and use the crank & rods from that, if you use the 4.0 pistons it will raise the comp ratio to approx 11/1 which may be too high for road use or pump gas.

Kevin.



Edited 1 time(s). Last edit at 06/16/2011 04:08PM by castlesid.


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