dohc for the 2.6

[cheaterparts]

Woody, there is plenty of torque and power to be had from the good ol' 2.6T. If you want even more revability, then consider a destroke using the 2L crank.

good call I've already got my 93 mm pistons for that job with taller piston hight just like 2L pistons 9 mm over size
this makes a 2.445 L only 110 cc down on the stock long stroke

cheater

[quest]

why even mod a 2.6 for revving? Starting with the wrong motor if you ask me.
What performance can't a 2.6 get you between 0 and 7500rpm ?
Is a low 11sec/high 10sec street car not enough ? Ever rode in one ?

[WidebodyWoody]

So what happens exactly if you down stroke an engine? Is it better then having it stroked? Please PM me for more info, Rather then cloging up this thread.

[Powerslave]

One thing is for sure , and many quest owners drool over the thought of a 4g63 in their quest. Some have made the conversion already , but it looks like it's the pinnacle of engines for the starion over in the states. The 4g54 is a great motor , and they can rev (my old sigma with extractors & weber carb used to run out of puff at 6800) , but there can be no argument that the 4g6X series is a more refined engine.

[karl_2ltgc]

why even mod a 2.6 for revving? Starting with the wrong motor if you ask me.
What performance can't a 2.6 get you between 0 and 7500rpm ?
Is a low 11sec/high 10sec street car not enough ? Ever rode in one ?

Starting with the wrong motor??
Your missing my point altogether.
Its not about what you cant do with one motor or the other.
Its about different paths to going fast.
I was merely trying to point out that to compare the two motors they need to be in similair 'trim'.
For example i tried to point out that a sigma 2.6 has a huge heavy flywheel, and a 2ltr starion banger has a nice lighter flywheel.

I am of the opinion that for driveability, cost and power reasons a 2.6 could realy do well in a starion. I have never said that 4g63's are no good, or slow or that they cant go realy fast.

And just incase you havnt noticed, generally with most 4 stroke internal combustion engines, the harder the rev em, the more power you make :D

[in2bishy]

there is a DOHC cylinder head in the works:

http://www.starquestclub.com/index.pl?b ... 1100130421


an 11lb. aluminum flywheel for the 2.6 (g54b) made over 5 years ago:

http://fidanza.com/aluminum_flywheels.html

[WidebodyWoody]

Thanks for the information. And welcome to the club

[quest]

karl_2ltgc
yeah, I understand comparing them on a 'level playing field', but why "ruin" a 2.6 to do it ? :)

Yes, the 2.6 (especially the 88/9 staz 240mm disc) has a 37 pound slug of a flywheel. Many folks on starquest club have them machined down to 21-22 pounds. Thats a whopping 15 pound reduction, and guess what ? Majority of folks said they felt absolutely no difference. Wierd, huh ? Probably more beneficial to a lightweight, free-revving track car, eh.

Its proven what a 2.6 street car can do. No guesswork needed there.

I'm kinda surprised to not see 300whp sohc 4g63 combinations show up around here, but I realize the more knowledgeable and experienced cats don't frequent forums. Don't see anyone running hi boost either.

In case you didn't notice, rpms are absolutely NOT necessary for a fast street car. Great if thats what flavour you prefer or want some hi hp 'figures' to brag about. Perhaps the most reputable and lethal street car roaming u.s. streets is a big heavy sedan powered by turbo Buick v6. Redlines ~5700rpm. A 5psi launch on ET streets will make you dizzy. Thats torque! Crappy 'hp figures' tho. Try line up against one.
ALL motors are trying to make torque. The higher the hp figures, means that you just had to rev the piss out of the motor to get it. No magic.

[toysrus]

300 whp is not very difficult to achieve on a SOHC just by sticking to the basics, 400whp is a challenge thou and imho for those that want to please everyone, stick with the 2.3L :D

[cheaterparts]

karl_2ltgc
yeah, I understand comparing them on a 'level playing field', but why "ruin" a 2.6 to do it ? :)

Yes, the 2.6 (especially the 88/9 staz 240mm disc) has a 37 pound slug of a flywheel. Many folks on starquest club have them machined down to 21-22 pounds. Thats a whopping 15 pound reduction, and guess what ? Majority of folks said they felt absolutely no difference. Wierd, huh ? Probably more beneficial to a lightweight, free-revving track car, eh.

there is a very good reason to use a 2.6 cause they are cheap
and as an engine to mod there simple to work on perform well and are strong How good is that

you may be able to get 4G63s cheap I dont know

as for fly wheel weight you are partly right as it is less effective at lower rpw and taller gears
by the way I make my flywheels 11 pounds and yes there is a notable difference ( track car only )

[karl_2ltgc]

Ok fair points there. Are you in australia cos when i say 2.6, i dont mean the shit that came out in widebody starions. I mean cheap as chips sigma 2.6's.
Unlike the widebody 2.6's, they dont have the crap jet velve head, they dont have the crap single point injection. Were as a sigma 2.6 block with magna head and injection with sigma turbo exhaust manifold, thats a realy great base to go hard with.
Also you will find that you can go realy big with a cam on a 2.6, and it will still be a torquemonster with huge midrange to boot.
I am well informed about torque, my street/race jigger for a while has been a 75 galant with a n/a 2.6...did i mention it weighs in at 950kgs :D

[mrb1]

300 whp is not very difficult to achieve on a SOHC just by sticking to the basics, 400whp is a challenge thou and imho for those that want to please everyone, stick with the 2.3L :D

I think 300 whp would be an "all out" attempt with the 4G63 SOHC. Guy's it is not EASY to get this power. It would take pretty serious head work (and everything else) to achieve that. Name a guy on this list with a 4G63 SOHC making 300 whp? I'm not trying to be smart I'm just saying it's not easy :)

[karl_2ltgc]

Just for comparison there are a few sigma 2.6's with efi intercooler and turbos and damn near stock internals that pump out around 200kw at wheels without much trouble, nor revving hard(im talking 5,500rpm here).

of course theres also a few with not so stock internals pumping out plenty more ponies :D

[NXTIME]

300 whp is not very difficult to achieve on a SOHC just by sticking to the basics, 400whp is a challenge thou and imho for those that want to please everyone, stick with the 2.3L :D

I think 300 whp would be an "all out" attempt with the 4G63 SOHC. Guy's it is not EASY to get this power. It would take pretty serious head work (and everything else) to achieve that. Name a guy on this list with a 4G63 SOHC making 300 whp? I'm not trying to be smart I'm just saying it's not easy :)

I agree. I would imagine that the names on this "300+whp" list would be very, very few.

[quest]

I don't believe its any harder to get 300whp from the sohc 2L as any other 4cyl, eh. Apart from head porting, what extra is 'required' ? Now I'm only referring to mpi cars.
What I *don't* see is folks applying the same effort.

Take the 4g63 dsms or sr20s for example;
a t3 or 16g sized compressor @ ~18-24psi
a t04b or 20g sized comp ~18psi
who is doing it to their sohc ?
Are we talking about race gas, maxed hp dyno runs with ignition timing ~22-24 under full boost ?

There was an superb staz effort shown on an oz website that dyno'd ~300hp? at only 15psi, in some shootout competition. Iirc it came runner up to a 2.6 izusu? May have been a link from beyond the limit? or coltspeed? site. Anybody remember it ? I think it is an excellent example of street 2L setup.... nothing exotic.