LANCER wrote on 06/09/13 at 05:10:52:In an effort to get rid of the assorted electrical demons from the past few years and carb vibration issue of last year I am in process of putting the REX engine into a stock '87 frame with the carb in the original position behind the engine and using a fresh wiring harness from an '05 donor parts bike.
I ran the engine for 10 years with the original Stage 1 cam and found 4500-5500 rpm to be very smooth, and up to 6000 a nice extension.
Yes, it is old tech for sure, but I like old tech. In fact, I would have preferred that it had a 2 valve head like the "oldies". I think Suzuki made the exhaust ports squirrelly on purpose, so it would not be confused with or in competition with the DR series.
Both have very nice intake ports but the DR also has nice exhaust ports. It is interesting that they had many common parts in the pre-'96 years, including basic cylinder structure, piston/pin, valves, springs, and camshaft core. The cam is built to a different profile but it is the same core. I have taken old cam cores from DR's and sent them to Webcam to be made into Stage 1/2/3's.
So, with so many common parts (and there may be others as well in the bottom end) why did Suzuki make the exhaust ports different ?
Why did they make 2 engines that were very much alike in many ways, different in other ways ? It would have been much more cost effective to build one good engine and use it in both machines. It is done quite often. Perk one up for dirt racing and detune it for the cruiser version.
I would like to have had a chat with the people who made these decisions.
I just want to know !
Lancer...with all this in mind.......is it possible to adapt a DR head and rocker box to a LS cylinder? And if so,wonder what improvement it would make?
Also on the subject of poor exhaust ports,I figure when it's time to pull my engine down I will do some exhaust port work for better evacuation. Earlier I was thinking to polish the intake ports but now I wonder if the rough surface may not be better for mixing the air and fuel. Any thoughts?
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