Bore spacings of a V12 or AJ6 Jag engine?
- Thread starter xctasy
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A
Anonymous
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Still looking myself. There's a head on ebay for 150.00 and a whole motor for 200.00 The whole motor sounds better, cause if it'd work you'd likely need xtra parts from the donor engine as well as the head. I just can't afford to buy it and have it shipped across the country without knowing it's going to be even close to feasible.
The kind of salvage yards I frequent don't ever have jags in them.
The kind of salvage yards I frequent don't ever have jags in them.
rickwrench
Famous Member
I read 3.8125" bore centers somewhere on this forum, the same as the Datsun/Nissan I6. The 200 is 4.08".
Rick(wrench)
Rick(wrench)
Good on ya matey!
Yep, that was from Heathdaily, and the Nissan, from me!
The XK-E engine was 3.8125", so was the L-series Nissan.
The V12 and AJ-6 engines were able to share cylinder heads, and have a much wider bore spacing than the long stroke 2.4,2.8,3.4,3.8 and 4.2 DOHC engines. They are much longer.
The Australian Commodore was going to get the AJ-6 engine in 1985, but Jag we unable to deliver enough. It was also a lot longer than any six that had been in the Commodore, including the German Opel SOHC 3.0, which was 4.125".
The aftermarket liners made by Lister could take a 3.543" to 3.7". The V12 was open deck, and looks pretty close to Falcon I6 bore spacing to me. Factory strokes were 2.76, or 3.09", with Lister making a 3.31" stroker kit to make a 427 cube V12.
The biggest, fattest bored freek was a 3.88" bore version with siameshed bores. By the look of it, I'd say 0.25" of metal from one bore wall to the other, and that makes 4.13" bore spacing. As Jack said, adding a 3" deck plate gives strokes up to 4.33", and that is up to 614 cubic inches, or 10 liters.
This item below is a 98 mm bore version, an overbore - special liners, gaskets, bore centres moved .
Using the vanishing point rule from point geometry, I can calculate the bore spacings using x, y co-ordinates in Paint on my computer. The fisrt bore closest is assigned as 98 mm, and then each bore is then divided up and calculated. I came up with 4.13".
The details of the valve sizes for the AJ-6 have been published by Heathdaily, so I can use the same match and scale method to calculate the bore spacing with the second generation six cylinder engine.
I can establish the bore spacings only on the AJ-6, not the fat 12 above!
Failing that I've got a mate with a 5.3HE V12 Daimler Sovreign 15 miles away. Good excuse to drive the Toyota tomorrow.
Meantime...hey Jack Collins, get your bonnet up, brother, and measure the AJ-6 engine in your Jag!. Got a wicked set of plans if it comes in at the same as the Falcon I6....
Yep, that was from Heathdaily, and the Nissan, from me!
The XK-E engine was 3.8125", so was the L-series Nissan.
The V12 and AJ-6 engines were able to share cylinder heads, and have a much wider bore spacing than the long stroke 2.4,2.8,3.4,3.8 and 4.2 DOHC engines. They are much longer.
The Australian Commodore was going to get the AJ-6 engine in 1985, but Jag we unable to deliver enough. It was also a lot longer than any six that had been in the Commodore, including the German Opel SOHC 3.0, which was 4.125".
The aftermarket liners made by Lister could take a 3.543" to 3.7". The V12 was open deck, and looks pretty close to Falcon I6 bore spacing to me. Factory strokes were 2.76, or 3.09", with Lister making a 3.31" stroker kit to make a 427 cube V12.
The biggest, fattest bored freek was a 3.88" bore version with siameshed bores. By the look of it, I'd say 0.25" of metal from one bore wall to the other, and that makes 4.13" bore spacing. As Jack said, adding a 3" deck plate gives strokes up to 4.33", and that is up to 614 cubic inches, or 10 liters.
This item below is a 98 mm bore version, an overbore - special liners, gaskets, bore centres moved .
Using the vanishing point rule from point geometry, I can calculate the bore spacings using x, y co-ordinates in Paint on my computer. The fisrt bore closest is assigned as 98 mm, and then each bore is then divided up and calculated. I came up with 4.13".
The details of the valve sizes for the AJ-6 have been published by Heathdaily, so I can use the same match and scale method to calculate the bore spacing with the second generation six cylinder engine.
I can establish the bore spacings only on the AJ-6, not the fat 12 above!
Failing that I've got a mate with a 5.3HE V12 Daimler Sovreign 15 miles away. Good excuse to drive the Toyota tomorrow.
Meantime...hey Jack Collins, get your bonnet up, brother, and measure the AJ-6 engine in your Jag!. Got a wicked set of plans if it comes in at the same as the Falcon I6....
I've got a pretty good mathematic approximation done...came up with about 4" bore spacing for the six and v12, neat.
I did some rectangular to polar measurements on the AJ-6 Photo,
I measured each intake valve at 1.383", and each exhast at 1.244".
I then worked out what the photo distance was.
The left edge of the photo is distorted, with a scale factor of 1 to 16cm. The centre has a 1 to 18.4 scale factor, the right most side, back to 1 in 16 units.
(This is a standard photogrametry technique, using known lengths)
Any way, answer was 3.98" bore spacing for the Jag AJ-6 engine. No way will it fit on a 240 or 300, but the head may fit a 250 Falcon six.
It would fit on a Slant Six 225 , though!
That done, I'm off on another excapade tomorrow....funding a log headed V12
I did some rectangular to polar measurements on the AJ-6 Photo,
I measured each intake valve at 1.383", and each exhast at 1.244".
I then worked out what the photo distance was.
The left edge of the photo is distorted, with a scale factor of 1 to 16cm. The centre has a 1 to 18.4 scale factor, the right most side, back to 1 in 16 units.
(This is a standard photogrametry technique, using known lengths)
Any way, answer was 3.98" bore spacing for the Jag AJ-6 engine. No way will it fit on a 240 or 300, but the head may fit a 250 Falcon six.
It would fit on a Slant Six 225 , though!
That done, I'm off on another excapade tomorrow....funding a log headed V12
Um, cost, Adam. I'm a scottist tight a$$.
Instead, I had to pick up the engine lifter today from my mate Evan's rural property. My son and I asked him to open up his V12 Series 3 5.3 HE, and we found the bore spacings are 3.95", or just over 100 mm.
He has some work to do on the engine, so I guess I will see a head gasket soon enough.
Oh, and Junior was impressed as the bonnet folded forward...."theres two sixes in there, dad!".
Instead, I had to pick up the engine lifter today from my mate Evan's rural property. My son and I asked him to open up his V12 Series 3 5.3 HE, and we found the bore spacings are 3.95", or just over 100 mm.
He has some work to do on the engine, so I guess I will see a head gasket soon enough.
Oh, and Junior was impressed as the bonnet folded forward...."theres two sixes in there, dad!".
Think of the credibility you'll gain at Repco... One week you're asking buying bearings for a Falcon, the next a head gasket for a Jag. Follow it up a month later with pinion bearings for a Rolls. People will ask you for financial advice, imagining your stratospheric rise... Dunedin will be in the palm of your hand.
addo":185n1zb5 said:Think of the credibility you'll gain at Repco... One week you're asking buying bearings for a Falcon, the next a head gasket for a Jag. Follow it up a month later with pinion bearings for a Rolls. People will ask you for financial advice, imagining your stratospheric rise... Dunedin will be in the palm of your hand.
Ahh, the illusions of grandour!
I'll get there, but only if I look after the small things first.
Funny you should say Rolls, Adam. Guess what Evan has...a Pincess 4 litre, with a junked Rolls Royce twin carb 4 liter engine.
He's looking at putting a turbo LD28 in the old girl, with the stock FMX based Borg Warner 3-speed, which is still in good nick.
A
Anonymous
Guest
anymore news on the jag head xtaxi? What i want to know is if it WILL fit on the 250, and will exhaust and intake be manageable to make for it. I cant wait to know more about it, cause having a jag head would be absolutely awesome.
Me not think it's doable, Jeddi! Send you broke, it will.
The AJ-6 is the same 3.95" bore spacing as the Twelve, so it won't fit the small 144 to 250's without a total weld up of the existing Ford head studs. Outer cylinders are 20.4" appart, on the Jag, its 19.75. Those extra few inches are where a miss is a mile.
You see, both the V12 and AJ-6 are blessed with head studs which go right up from the block through the cam bearings. So your gonna have to sleave the outer cylinders 1, 2 , 5 and 6, and re centre them to match the head, get some offset con-rods, and then.....then make up a new front cover.
Argggggghhhhhhhhhhhh Ja -6
The AJ-6 is the same 3.95" bore spacing as the Twelve, so it won't fit the small 144 to 250's without a total weld up of the existing Ford head studs. Outer cylinders are 20.4" appart, on the Jag, its 19.75. Those extra few inches are where a miss is a mile.
You see, both the V12 and AJ-6 are blessed with head studs which go right up from the block through the cam bearings. So your gonna have to sleave the outer cylinders 1, 2 , 5 and 6, and re centre them to match the head, get some offset con-rods, and then.....then make up a new front cover.
Argggggghhhhhhhhhhhh Ja -6
A
Anonymous
Guest
i understand, wise master...i see the dark side has won once again
. OO6/The-X-Or-Six!
