about to put in the 4.6, engine questions - Defender Source
Defender Source  

Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions

Thread Tools
Old February 27th, 2006, 09:10 AM
vesparover's Avatar
Status: Offline
brian bertolini
Join Date: Sep 2003
Location: charleston, sc
Posts: 152
about to put in the 4.6, engine questions

So, I'm finally getting around to putting this 4.6 into the defender. How many of you out there did your own porting? I'm trying to decide if it would make enough of a difference? I don't want to sacrifice torque for horsepower. Also, I need new push rods- should i go with adjustable rods or keep them stock? I'm running a hotter cam, but the 3.9 heads. I take it the pushrods are the same between the 4.6 and 3.9? Also, I'm going to replace the clutch discs and throwout bearing. Is oem the way to go?
Brian Bertolini

Follow-up Post:

just realized I'd already asked about the clutch. So it looks like Oem is the way to go.
Brian Bertolini
Reply With Quote
Sponsored Links
Old February 27th, 2006, 11:32 AM
LRover's Avatar
Status: Offline
J. Michael McCaig
D90 ST, LR110, Series IIa, RRC
Join Date: Oct 2003
Location: VA
Posts: 479
I just did a 4.6 with 3.9 heads and a mild cam for my 110 and I used standard push rods as I did not shave my heads any (yes they are all the same). I de-burred and polished the ports some but I did not port match them per say. I used oem clutch, diaphram and thowout bearimg...don't forget your pilot bushing as that should be new too. Did your crank have a dowel pin that you had to deal with before mounting the flywheel? The torque difference between my old tired engine and the 4.6 is amazing.
Reply With Quote
Old February 27th, 2006, 11:10 PM
Jack_Straw's Avatar
Status: Offline
Join Date: Feb 2006
Location: NH
Posts: 17
If you're going to flow your ports without doing any other headwork you're better off just removing the obstructions and not going crazy grinding material, especially deep within the throats. Just de-burring and polishing will give you all the flow you need if you're running stock injectors/trumpets/headers ect. As far as push rods go you'll be fine with stock as long as you didn't go crazy with the cam and check your lifter preload ahead of time.
Reply With Quote

Lower Navigation
Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
4.0 to 4.6 parts? gtg067i Defender Technical Discussions 6 September 11th, 2010 08:40 AM
4.6 engine and misc parts for sale in Colorado 89beastie For Sale - Parts 1 November 29th, 2007 11:18 AM
leak at front engine mail seal (due to vibration?) => two questions? MonLand Defender Technical Discussions 23 August 31st, 2006 09:30 AM
Bosch 4.6 Engine FOR SALE RedRhinoProducts For Sale - Parts 8 February 21st, 2006 10:53 AM
Oil Info XD90 Defender Technical Discussions 5 September 7th, 2004 10:07 PM

All times are GMT -5. The time now is 04:44 PM.