How to tell if 3.5 or 3.9 V8i - Land Rovers Only

FrankS · 08-10-2005, 09:12 AM

Is there a way to identify if the engine in my '93 Discovery is a 3.5 or a 3.9 without sticking a bit of wire down spark plug hole and measuring the stroke.
Also I believe there are stroker cranks available that will take it out to 4.5 or there abouts, new to Forum and to Discoveries, I have a feeling that being a mechanic is going to come in handy, Regards Frank.

TerryS · 08-10-2005, 09:49 AM

I've never seen a 3.9 that didn't have "3.9" (gee, what a coincidence) cast into the top of the plenum cover, and vice versa, I've never seen a 3.5 that had anything (like 3.5) cast on the cover.

FrankS · 08-10-2005, 06:49 PM

TerryS, thanks for that info, I have seen a few Discos (later Models) and haven't noticed anything cast onto the top of the Plenum, can anyone here in Australia confirm that Australian engines are the same as in the USA. Also any info on Stroker cranks would be welcome, Regards Frank.

Disco · 08-10-2005, 07:31 PM

Terry is correct. The same applies here in OZ. With regards to your stroker question....http://www.triumphroverspares.com.au...sportparts.htm

Also our overseas comrades might enjoy some of the goodies in there. The twin throttle body kit looks pretty 'schmick'.

FrankS · 08-11-2005, 04:53 AM

Thanks Disco, some pretty tasty goodies, but big bikkies, a 5L efi Ford engine is looking good, know if anyone makes adapters for the Ford 5L to go to the Disco Auto box, my engine is the 3.5 / 8.13:1 C/R. Can a 3.5 be bored out to a 3.9, still learning, Regards Frank.

Badger1 · 08-11-2005, 12:27 PM

Damn, thanks for that link Disco! There is some pretty tasty stuff on that website, I better get a second job.

Disco · 08-11-2005, 07:11 PM

Yes Frank, your 3.5 can be bored out to either 3.9 or 4.2. If you are going to do this, then the 4.2 would be my choice. I don't know of anyone doing an adapter for a 5L Ford motor but you might try..http://www.marks4wd.com/rrovauto.html. Personally, I'd rather fit a Chevy LS1 5.7L mated to a 6L80E auto trans.

08-10-2005, 09:12 AM	#1 (permalink)
FrankS Senior Member Join Date: Aug 2005 Location: South Coast NSW Australia Posts: 102 Gallery: 0	How to tell if 3.5 or 3.9 V8i Is there a way to identify if the engine in my '93 Discovery is a 3.5 or a 3.9 without sticking a bit of wire down spark plug hole and measuring the stroke. Also I believe there are stroker cranks available that will take it out to 4.5 or there abouts, new to Forum and to Discoveries, I have a feeling that being a mechanic is going to come in handy, Regards Frank.

08-10-2005, 07:31 PM	#4 (permalink)
Disco Super Moderator Join Date: Dec 2004 Posts: 1,819 Gallery: 0	Terry is correct. The same applies here in OZ. With regards to your stroker question....http://www.triumphroverspares.com.au...sportparts.htm Also our overseas comrades might enjoy some of the goodies in there. The twin throttle body kit looks pretty 'schmick'. __________________ No hand signals, driver playing with his transfer Knob.

08-11-2005, 07:11 PM	#7 (permalink)
Disco Super Moderator Join Date: Dec 2004 Posts: 1,819 Gallery: 0	Yes Frank, your 3.5 can be bored out to either 3.9 or 4.2. If you are going to do this, then the 4.2 would be my choice. I don't know of anyone doing an adapter for a 5L Ford motor but you might try..http://www.marks4wd.com/rrovauto.html. Personally, I'd rather fit a Chevy LS1 5.7L mated to a 6L80E auto trans. __________________ No hand signals, driver playing with his transfer Knob.

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08-10-2005, 09:49 AM	#2 (permalink)
TerryS Moderator Join Date: Aug 2004 Location: Bloomfield, CT If I died today, I lived there all my life. Posts: 2,151 Gallery: 0	I've never seen a 3.9 that didn't have "3.9" (gee, what a coincidence) cast into the top of the plenum cover, and vice versa, I've never seen a 3.5 that had anything (like 3.5) cast on the cover.

08-10-2005, 06:49 PM	#3 (permalink)
FrankS Senior Member Join Date: Aug 2005 Location: South Coast NSW Australia Posts: 102 Gallery: 0	TerryS, thanks for that info, I have seen a few Discos (later Models) and haven't noticed anything cast onto the top of the Plenum, can anyone here in Australia confirm that Australian engines are the same as in the USA. Also any info on Stroker cranks would be welcome, Regards Frank.

08-11-2005, 04:53 AM	#5 (permalink)
FrankS Senior Member Join Date: Aug 2005 Location: South Coast NSW Australia Posts: 102 Gallery: 0	Thanks Disco, some pretty tasty goodies, but big bikkies, a 5L efi Ford engine is looking good, know if anyone makes adapters for the Ford 5L to go to the Disco Auto box, my engine is the 3.5 / 8.13:1 C/R. Can a 3.5 be bored out to a 3.9, still learning, Regards Frank.

08-11-2005, 12:27 PM	#6 (permalink)
Badger1 Forward! Join Date: Jul 2005 Location: Loo-eee-ville, KY Posts: 2,153 Gallery: 1	Damn, thanks for that link Disco! There is some pretty tasty stuff on that website, I better get a second job.

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