4.4 v8 P76 carby issues? What to do.

Joined: 24 Mar 2008 Location: melbourne

HI all i have a range rover with a P76 engine in it, its got a 350 holley on it and it has issues.
1: It bogs down way too easy on hills then really struggles to start.
2: I need to make a snorkel to fit it and really struggling to find something to fit it

Basically id like to know what the options are any help is good,
Thanks Tim

Joined: 16 Jun 2007 Location: New Zealand

modifying a manifold is the best solution I think, either modify the P76 with the top of a rover and run SUs or strombergs, or modify an efi manifold to fit the p76 either way a snorkel can be fitted easily

Joined: 24 Mar 2008 Location: melbourne

I might have access to i 3.9 motor is it worth trying to inject the P76 or not bother

Joined: 12 Jun 2005 Location: Yinnar South, Vic

Put it on Gas Wink

Joined: 20 Aug 2007 Location: mornington peninsula

gas is the way to go Very Happy

Joined: 24 Mar 2008 Location: melbourne

yeah gas is a good idea but what does a gas convesion cost $2000. its a lot to spend on a weekend car

Joined: 25 Jan 2005 Location: Healesville

then just apply to the gov for a rebate. AHHHHH cooking is better with GAS.

Joined: 20 Aug 2007 Location: mornington peninsula

government rebate is $1000 bucks i think

Joined: 24 Mar 2008 Location: melbourne

yeah thats not a bad option just need to get some other rover problems to sort out but thats a good option

Joined: 12 Jun 2005 Location: Yinnar South, Vic

firey69 wrote:

government rebate is $1000 bucks i think

2k in vic

How about I sell you a good running 4.4 with reco heads and LPG setup for $700

Joined: 25 Jan 2005 Location: Healesville

CLOUGHY WROTE:

Quote:

How about I sell you a good running 4.4 with reco heads and LPG setup for $700

If you dont want it YE OLDE RANGIE I certainly would like to take it off your hands. let us know. armsup

Joined: 12 Jun 2005 Location: Yinnar South, Vic

Oh, by the way, it don't run on fuel, has a 350 holley, its "missing bits" only picked it up last night, so haven't looked, goes well but, 4 straight 12.5hr night shifts now, so wont look for a while yet Crying or Very sad

Has a sprint gas mixer and complex convertor, dont THINK it leaks oil, looks really clean and dry

Joined: 11 Jan 2004 Location: Brisbane

Tim I've sent you a pm regarding an existing modified P76 manifold with the twin strombergs. I looked into putting the efi from a 3.9 onto the P76 before xmas but there were no workshops up here that were interested in doing it. There are adaptors available from somewhere in Melbourne - there is a thread on here. Unsure whether the standard computer will run a P76 - others may know better.

I can tell the you the difference offroading between a P76 with 350 Holley and 3.9 efi is incredible - I had issue with the holley flooding - some have overcome this, but I was never able to. I have no experience with gas. Now I can actually choose a line rather than point, floor it and hope for the best.

If I had kept the 2 door on the road I would have fitted the manifold with twin strombergs.

Good Luck with it

Joined: 13 Sep 2007 Location: Brisbane

My vote is to run a 2-barrel Throttle body from EA falcon or GM TBI adapted to the standard 2-barrel P76 manifold with Megasquirt. Or run LPG. Pretty sure the gov rebate for a used car is $2k in all states except WA, where it is $3k!

Joined: 22 Dec 2007 Location: Port Stephens

I fitted the standard Rangie manifold and carbies with adapter plates from Marks Adapters to mine, had no problems on or off road.

Joined: 24 Mar 2008 Location: melbourne

standard rangie carbie as in twin SU's or whatever they are? Have you had any problems with lack of fuel feed or too much??

Joined: 22 Dec 2007 Location: Port Stephens

Quote:

standard rangie carbie as in twin SU's or whatever they are? Have you had any problems with lack of fuel feed or too much??

I know longer have the car but had it for several years with the P76/Rover manifold setup. The carbies were the standard SU type Strombergs that were fitted to the 3.5 engine, never had an issue with this set up at all, had plenty of torgue, no fueling problems. I had the rover heads fitted as well so maybe this helped with the fueling?, fitting the Rover heads is another issue though as there are oiling problems to over come although no that difficult if you know how, also the rover heads have an extra head bolt so the P76 block will need to be drilled and tapped.

Joined: 16 Jun 2007 Location: New Zealand

I had SU HS carbs on mine but removed them due to the shocking spacers that kept leaking, so I have a holley 350 on an adaptor while I modify another P76 manifold to run the SUs.
You dont have to use the outer bolts if you fit the rover heads (later heads dont have them anyway) but you do have to drill the oil feed, I recently trashed a block drilling it as when I blew the swarf out I had an air leak to the water jacket, possibly a bad casting.

Joined: 09 May 2008 Location: MELB

hey, im running a stromberg single at the moment on my 4.4, it starves a fair bit. I had a 350 holley running on my 3.5 and a snorkel. i had the gas research body cut and atatched a 4inch into 3 inch downpipe reducer off a house downpipe, to feed into a later model air cleaner then a hose to the snorkel. worked fine. the holley had no problems off road as the carby was reversed and an overflow clip inserted at the float end of the tank. im now trying to fit the holley to my 4.4 bit of stuffing around, hope that helps...

Joined: 11 Jan 2004 Location: Brisbane

4.42doormangierangie wrote:

the holley had no problems off road as the carby was reversed and an overflow clip inserted at the float end of the tank. ...

Can you please explain what you mean by "an overflow clip inserted at the float end of the tank"

If the holley is reversed, wouldn't it flood going down a hill instead?

I always thought it was bad having the car stall while going up a hill until it did it going down a steep section due to one mechanics modifications to the holley - that mod was removed very quickly - no brakes or steering.

I have spoken to someone who had one reversed on a comp truck, but also had a manual accelerator cable to increase the revs to reduce the flooding

Cheers

Joined: 07 Sep 2005 Location: stockton 200m from beach

Have a read at what ive posted in here if ya still cant work out what ive done send me a pm and i can take some pics and email em as i cant work out how to post em on here ....
http://www.outerlimits4x4.com/ftopic139421.php

This set up runs a homebrew snorkel made from PVC and a few bits from commadors VB,VL,VN and works grate Very Happy

Also dont fool ya self with a reversed holly its the worse thing ya can do my mod to the bowl works the best even beta than the so called off road kit which is the plastic extension for the original vent there a waste of money so is the spring loaded neadle and seat armsup

Joined: 09 May 2008 Location: MELB

i hadnt found a limitation with the 350 on steep angles?? with the bowl reversed i had no issues. the plastic clip is inside the bowl where the jets are cost me 2 bucks from les richmond. i was told it reduces the flooding effect and with it in place it allows you to comfortably decend hills without stalling. have you got photos of your holley modded?? i would love to have a look..

Joined: 09 Feb 2008 Location: Preston, VIC

a simple solution is to turn the holley around. with the float at the front, it wont lean out going up the hills.

I had that problem with my old engine, although i also had the problem of a 650 being way too big hehe...

Joined: 16 Apr 2008 Location: gold coast

I have removed the old P76 manifold and replaced it with a willpower 4 barrel and then fitted a Holley Projection Unit to the top of it including VL efi pump and swirl pot.

It's not tuned properly as yet, however I have gained 2.5l to the 100 K so far. Getting 16.3 ltr to the 100k. The orginal old manifold with the twin carb setup and ali Y adaptor was giving me 18.88l to the 100k so I'm ahead on fuel economy and way up on HP. HUGE DIFFERENCE!

Matt
(Previous known as MATTA on thsi forum)

Joined: 26 Oct 2005 Location: Perth

Quote:

I know longer have the car but had it for several years with the P76/Rover manifold setup. The carbies were the standard SU type Strombergs that were fitted to the 3.5 engine, never had an issue with this set up at all, had plenty of torgue, no fueling problems. I had the rover heads fitted as well so maybe this helped with the fueling?, fitting the Rover heads is another issue though as there are oiling problems to over come although no that difficult if you know how, also the rover heads have an extra head bolt so the P76 block will need to be drilled and tapped.

Teg,
do you know what push rods were used with the rover heads on the P76 block?
Cheers Euan

Joined: 25 Oct 2003 Location: Melbourne Australia

EFI.