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V8 Questions

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hingmy:
1. no - I believe there are "notches" for clearing the injectors. I'm looking at going over to EFi and was told i'd need to carry out this modification or change the heads.
2. I'm looking at fitting an LE1 from Lund engines (www.lundengines.com). Steve Lund certainly knows his stuff. At present I have a 3.9 cam in my 3.5 and it drops peak down the revs considerably so its quite easy to tickle it to get it moving but it has seemed to push peak horses up the range so there's more need to make that noise.
3. As V8redline said - its very broken unless as Datalas pointed out its just a core plug. Where's it coming from?
4. A little bit can be taken of the head to dress it  but v8's alter the compression through piston choice and he amount of "dish" the tops have.

Eeyore:
1) I don't know enough aboput 3.5 heads I'm afraid!

2) Fitting a hairy cam will have an impact on horse power and power curve - whether the cams in question will give you the curve you like is a different question. Often, though, it isn't the neck-snapping type enhancement folk expect. This is mainly due to the fact that major improvements will require tweaked heads and valving etc. You won't make 250hp from just the cam. But it is usually more effective than just chipping a Hotwire EFi system.

3) If waters getting into the cylinders and the oil, I'll doubt it's a core plug (as I'm sure the plugs don't interfere with the lubrication system. It sounds scarily like a cracked block.

4) Yes, you can skim the heads for a bit more compression but..........

Check out the amount of work that Lund, JE Eng, John Eales and RPi put into making the bigger hp improvements.

Now, we do know a very nice man selling a 3.9 Efi.........don't we, Mr Web!

cheers
 8)
Eeyore

Range Rover Blues:

--- Quote from: "muddysteve" ---1 Are the heads from a 3.5 efi the same as a carb engine?
--- End quote ---


No, the combustion chamber is different and there is a cutout for the injectors, they also breath better.  You could run them on a carb though and probably notice a difference.


--- Quote from: "muddysteve" ---2 Has anyone fitted a fancy cam shaft like the ones that turn up on ebay quite often?
--- End quote ---


If you fit a standard cam from a 3.9 to a 3.5 EFi you can get as much as 10hp, worth a thought.


--- Quote from: "muddysteve" ---3 If the coolant froze in the engine and now i've got water squirting out of 2 cyinders on one side and water in the oil what do you thinks gone?
--- End quote ---


If you're lucky a head gasket but quite possibly the block.


--- Quote from: "muddysteve" ---4 Can i skim the heads to get a bit more compression?
--- End quote ---


You can but I wouldn't advise it.  You'll end up having to retard the timing and even then it'll be a problem.  The cretin who had our car before us skimmed the heads, he'd got 205psi cranking pressure :shock: Now it ran well on LPG, which has an octane rating of 115 and burns slowly but to get it to run on petrol he'd retarded the timing to 2 degrees so it didn't run that well anyway, but worst of all if you ran on petrol and give it some throttle it would burn out exhaust valves in about 2 minutes :evil:

If you're going to skim the head then fit a composite gasket, they are thicker then standard but actually more reliable.  I've fitted 2 and am dead happy with them 8)

muddysteve:
thanks for the replies chaps, much appreciated

can anyone see any issues with this plan

take of the heads from the dud efi lump, rebuild them ie tappets, valve stem seals an lap the vavles back in.
only skim them if they need it, hopefuly they wont. and then put them in my disco 3.5 on carbs

remove all the ancillaries from the dud engine and ebay them.

the thinking behind this is i've got a noisy tappet and i'm burning a little oil so hopefully overhauling the heads will cure this

Steve

Range Rover Blues:
The tappets don't sit in the heads, they sit in the top of the block and can be removed without taking the heads off, as can the cam obvioulsy.

As for your plan, I'd say make sure both heads are skimed the same, you can check this because there is a witness drilled into a small square peg on the front of the D/S head and the back of the P/S, the heads being the same.

Burning oil? ours does this and rebuilding the heads didn't help unfortunatley.  Whilst you've got the heads off check for the wear ridge caused by the rings.  Plus unless it's a newer head then the valve stem oil seals are more of a token gesture.  New valve guides might help a little but how much are you going to spend to save a little lost oil?

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