Desiring more TQ from my AJ126 motor
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Last edited by Obi; Sep 23, 2025 at 07:23 AM.
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From: Adelaide, South Australia
No, I didn't miss them at all.
Yes the V6 can be bored and stroked to increase it's displacement, IIRC someone has done this to something like 3.4 litres.
My point was that you can't just plonk V8 pistons in an otherwise stock V6, they won't fit.
Without some research I don't know the exact difference between the V6 bore and the V8 bore but I suspect it is more than the rebore limit of the V6, maybe someone else can chime in on this?
I'll gladly eat my hat if a V6 can be safely bored to fit V8 pistons.
Yes the V6 can be bored and stroked to increase it's displacement, IIRC someone has done this to something like 3.4 litres.
My point was that you can't just plonk V8 pistons in an otherwise stock V6, they won't fit.
Without some research I don't know the exact difference between the V6 bore and the V8 bore but I suspect it is more than the rebore limit of the V6, maybe someone else can chime in on this?
I'll gladly eat my hat if a V6 can be safely bored to fit V8 pistons.
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Joined: May 2019
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No, I didn't miss them at all.
Yes the V6 can be bored and stroked to increase it's displacement, IIRC someone has done this to something like 3.4 litres.
My point was that you can't just plonk V8 pistons in an otherwise stock V6, they won't fit.
Without some research I don't know the exact difference between the V6 bore and the V8 bore but I suspect it is more than the rebore limit of the V6, maybe someone else can chime in on this?
I'll gladly eat my hat if a V6 can be safely bored to fit V8 pistons.
Yes the V6 can be bored and stroked to increase it's displacement, IIRC someone has done this to something like 3.4 litres.
My point was that you can't just plonk V8 pistons in an otherwise stock V6, they won't fit.
Without some research I don't know the exact difference between the V6 bore and the V8 bore but I suspect it is more than the rebore limit of the V6, maybe someone else can chime in on this?
I'll gladly eat my hat if a V6 can be safely bored to fit V8 pistons.
it was also reportedly done to 3.7L to match the V8 pistons. The 3.4 was titanium rods and custom pistons.
“My point was that you can't just plonk V8 pistons in an otherwise stock V6, they won't fit”
- No one said nor implied you could, hence starting with increase displacement before talking about pistons.
“I'll gladly eat my hat if a V6 can be safely bored to fit V8 pistons.”
- V6 and V8 share the same block. Eat your hat lol
To be clear it was an overview of what could be done. Didn’t go into minutiae like it needs to be properly decked/honed, resleeved, etc…
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From: Georgia
yep, I definitely realizing that well what dead weight is behind the seats?
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Increase displacement, swap rods and pistons (consider using ones for the V8), custom fit a tvs 1900. Install a chiller system, use an octane booster, and have the car tuned for 96.
Or as other suggested buy a v8. To make a long story short, I was in your shoes a few years ago.
Had dual pulleys, wmi, tcu tune, forged rims, lithium battery etc.
Was in the middle of adapting the tvs 1900. Unfortunately (luckily) a deer killed my jag so I never finished... I bought a v8 instead
Assuming you can do most of the work yourself; should be within your budget. Biggest expense will be producing a one off intake manifold and intake runners.
There is a chance that the runners can be adapted as is, I was experimenting prior to moving to the v8. But if not you, can probably have a mold made of the runner and just change where the holes for the bolts go.
Or as other suggested buy a v8. To make a long story short, I was in your shoes a few years ago.
Had dual pulleys, wmi, tcu tune, forged rims, lithium battery etc.
Was in the middle of adapting the tvs 1900. Unfortunately (luckily) a deer killed my jag so I never finished... I bought a v8 instead
Assuming you can do most of the work yourself; should be within your budget. Biggest expense will be producing a one off intake manifold and intake runners.
There is a chance that the runners can be adapted as is, I was experimenting prior to moving to the v8. But if not you, can probably have a mold made of the runner and just change where the holes for the bolts go.
would you mind DM’ing me the info you have from when you built yours I’ve seen your post on other threads and I know you are a great source to help me build this car and yes I know getting a v8 is easier to do but I want to build a v8 killer, I don’t want the bimmer boys to have all the fun lol.
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From: Westport, CT
would you mind DM’ing me the info you have from when you built yours I’ve seen your post on other threads and I know you are a great source to help me build this car and yes I know getting a v8 is easier to do but I want to build a v8 killer, I don’t want the bimmer boys to have all the fun lol.
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