[StephenHallman]

I want to hear it... Don't be selfish now!

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[Cloud9...68]

With the winding down of the D1R supercharger availability, it's great for those of us whose desire/ability to add power is down the road a bit to see the continued efforts to wring more power out of these engines. I figure it will be at least a year, probably more, before I will have "grown into" the extensive mods I'm in the process of doing to my car, so hopefully by then there will be something available should I feed the need for more power. From following these threads, I can see how technically challenging and financially draining these efforts are, so I'm very grateful to see them continuing.

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[RS Barn]

Can you say "Cammy Idle" There's not hiding this is a pure racing motor

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[Seven30]

10 months have passed since the last post, any chance of an update?



On a side note - anyone considered making a 3.4 liter N/A ?



Best wishes for the New Year! <img src="/forum/images/smilies/968/smile.png" class="smilie" alt="" />

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[ds968]

I considered that when I had to have the top rebuilt, but my mechanic recommended against it ; first, even a 3.2 bore-out would not give you an entirely problem free engine or one which would last as long, then the added cost of custom pistons at $ 2,500 to

$ 3,000 just by themselves, brings the job to an expense total that hardly justifies the marginal increase in performance vs the alternatives ( DR1SC ). As for a 3.4 , according to everything I hear, it could be a grenade just waiting to blow up...

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[flash]

3.4 has been done a couple of times. success was mixed. over-heating is one problem. longevity is another.



3.2 has fewer of the problems, but they are still there. to do it right, you'd have to do liners and different rings. i am wrestling with the idea, if and when i need to tear the motor apart. it would ultimately make for a better engine, but at a considerable increase in cost, a fairly significant cut in lifespan, and i have no idea what it would do to the harmonic calculations of the balance shafts.



with all other things being equal, a 3.4 would add about 20hp, and a 3.2 would add about 12. torque increases would be similar.

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[Seven30]

[quote name='flash' timestamp='1325691042' post='120015']

3.4 has been done a couple of times. success was mixed. over-heating is one problem. longevity is another.



3.2 has fewer of the problems, but they are still there. to do it right, you'd have to do liners and different rings. i am wrestling with the idea, if and when i need to tear the motor apart. it would ultimately make for a better engine, but at a considerable increase in cost, a fairly significant cut in lifespan, and i have no idea what it would do to the harmonic calculations of the balance shafts.



with all other things being equal, a 3.4 would add about 20hp, and a 3.2 would add about 12. torque increases would be similar.

[/quote]



Hi Flash,



Please enlighten me on the over-heating problems: Are there localized over-heating problems (i.e. rear part of the cylinder head) or overall over-heating problems (water or oil temps above recommended levels)?



What are the reasons for the significant reduction in lifespan?



Thanks <img src="/forum/images/smilies/968/smile.png" class="smilie" alt="" />

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[flash]

there isn't a lot of material in there. i'm not sure they did the 3.4 without sleeving either, which would automatically mean less lifespan. i have no real information about the setup. as i said it was only a couple of times we ever even heard about it. it was many years ago, and anything about it was lost long ago.



i just looked at this idea though, and because i had to do a wet sleeve, and it's an open block design, i opted not to do it. knowing that i wanted to push the engine, and that it was supercharged, it was not recommended

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