Re-jetting a webber 500 carb

badger · Post by **badger** » Wed Jul 18, 2007 3:48 pm

Guys, I'm hoping someone on here can help me with this one as I'm struggling for time - not enough hours in a day to spend a day or so mucking about!

Just swapping a 3.5 for a 3.9 (rover) engine on a rangerover for a customer. it has a webber 500 carb fitted and I need to re-jet it for the 3.9. I've no idea what jets are currently fitted as I haven't had it apart yet, but I've got the "re-calibration" kit from Real Steel.

Can anyone give me any pointers as to what jets/metering rods will be correct for a 3.9 with a standard rover cam? Thanks.

Paul B · Post by **Paul B** » Wed Jul 18, 2007 7:16 pm

badger wrote:Guys, I'm hoping someone on here can help me with this one as I'm struggling for time - not enough hours in a day to spend a day or so mucking about!

Just swapping a 3.5 for a 3.9 (rover) engine on a rangerover for a customer. it has a webber 500 carb fitted and I need to re-jet it for the 3.9. I've no idea what jets are currently fitted as I haven't had it apart yet, but I've got the "re-calibration" kit from Real Steel.

Can anyone give me any pointers as to what jets/metering rods will be correct for a 3.9 with a standard rover cam? Thanks.

Look back through this section as there are dozens of posts about it, giving every possible convolution of what to use, or not to use.

gd302 · Post by **gd302** » Wed Jul 18, 2007 7:44 pm

i read on another website that for a 3.9 engine its 6552 rods and .083 primary jets

jefferybond · Post by **jefferybond** » Tue Aug 07, 2007 9:40 am

gd302 wrote:i read on another website that for a 3.9 engine its 6552 rods and .083 primary jets

This is 4% leaner than stock (6552 rods, .086 primary jets), and my 3.5 actually ran lean at this setting, and I found out that stock was best. I would use the stock jetting as a starting point and see how it goes. I think the type of exhaust manifold you have makes a big difference to mixture requirements, as well as the cam.

Jeff

badger · Post by **badger** » Tue Aug 07, 2007 1:14 pm

I ended up with std jets and rods, it seems fine at that.....

mgbv8 · Post by **mgbv8** » Wed Aug 08, 2007 7:32 pm

I use the stock setting for my low comp 3500, and it is a tad rich. But only on the back six pots. The front two always run a bit lean. I'm using the 500 and the offy 360 manifold.

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Re-jetting a webber 500 carb

Re-jetting a webber 500 carb

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