4 valve per cylinder vs 2

[stetracer]

I have been building these 8 and 16 valve motors for a very long time now and the 16v motor is far better in every way except for the crank gear and the clutch basket. The cam and rocker wear is a direct result of to much spring pressure, to tight of valve clearence, and/or not changing the oil often enough. Not by design. you do need to keep an eye on them as they are a part that will wear out in time just like anything else. When doing a valve adjustment check the condition of the rockers and replace any that are showing excessive wear. I run .410 lift intake cam my GS1150 and a .400 lift intake cam in on of my 1200 Bandits and the smallest cams I run are a Web 236 370 lift cam and have never had a problem with eating rockers up. I can honestly say I have never spit a shim through the side of a head on a 16v motor. But I have seen a few 8v shim motors spit the shim right through the head.

[tkent02]

I have been building these 8 and 16 valve motors for a very long time now and the 16v motor is far better in every way except for the crank gear and the clutch basket. The cam and rocker wear is a direct result of to much spring pressure, to tight of valve clearence, and/or not changing the oil often enough. Not by design. you do need to keep an eye on them as they are a part that will wear out in time just like anything else. When doing a valve adjustment check the condition of the rockers and replace any that are showing excessive wear. I run .410 lift intake cam my GS1150 and a .400 lift intake cam in on of my 1200 Bandits and the smallest cams I run are a Web 236 370 lift cam and have never had a problem with eating rockers up. I can honestly say I have never spit a shim through the side of a head on a 16v motor. But I have seen a few 8v shim motors spit the shim right through the head.

Are you saying you commonly see 16 valve Suzuki GS engines go well over 100,000 miles without requiring any engine work?

It is very common on the 8 valve engines.

[stetracer]

Are you saying you commonly see 16 valve Suzuki GS engines go well over 100,000 miles without requiring any engine work?

It is very common on the 8 valve engines.

I was talking performance but as you mention longevity yes the motors will both go over 100,000 miles if treated the same. There are guys getting over 100,000 miles on the old Bandits. Incase you did not know it Suzuki builds a pretty good bike

[Steve]

I can honestly say I have never spit a shim through the side of a head on a 16v motor.

Well considering that you would have to start with the shim on the outside and spit it INTO the head, I can understand that.

For the few that might not understand that, there are no valve shims inside the 16-valve engine.

.

[tkent02]

I was talking performance but as you mention longevity yes the motors will both go over 100,000 miles if treated the same. There are guys getting over 100,000 miles on the old Bandits. Incase you did not know it Suzuki builds a pretty good bike

I know they are good, and Bandits have different engines than the old GSes.
Have you commonly seen 16 valve GS engines go over 100,000 miles without engine work?

Maybe they do, but I have never seen it.

[stetracer]

I know they are good, and Bandits have different engines than the old GSes.
Have you commonly seen 16 valve GS engines go over 100,000 miles without engine work?

Maybe they do, but I have never seen it.

Yes when I worked at a bike shop I saw it on the bagger guys. I changed a $hit load of tires in my days
The roller bearing 16v GS motor if the oil is changed regular and not beat up on ( spending it life at red line ) would last as long as any motor Suzuki has made. It is not the motor design that makes one suzuki motor last longer than the other. It is the owner design that is the problem. ( baring any factory defects ). Now when you talk performance you can't beat the 16v head. and as the years go by they only get better.



Steve,
Suzuki did make a 16v rocker arm head that used shims for adjusting the valves for two years 91 and 92. A good head just don't put bigger cams in it.

[blowerbike]

91 92 gsxr...performance cams was a huge amount of $$$$

[stetracer]

91 92 gsxr...performance cams was a huge amount of $$$$

And not a good idea either.

[stetracer]

I like to drag race all my bikes and I like them to last that is why I like Suzuki 16v motors best because they are the cheepest and easiest to make extra hp. Lots of good aftermarket parts to choose from and even when built they still last if done correctly.

When I get my new to me GSX1100EFE I am removing the 1150 head and I am putting on a Ported 30/25 Bandit 1200 head on it. Just to add more HP. Why go to the Bandit/Gixxer head because it is cheeper and just plain better for what I want it to do I don't care to keep the stock look as the whole bike is custom already. And I want the bike to run at least some 9.40's it won't do that without spending some big $$$ on the 1150 head to make it flow as good as a ported Bandit head. Plus I have 6 Bandit/Gixxer heads sittin on the shelf and I can get a pretty penny for a clean virgin 1150 head to help recover the cost of the Bandit/Gixxer head build

[blowerbike]

stretracer,
are you from the tampa area?
rideoutcyclesinc maybe?

[stetracer]

stretracer,
are you from the tampa area?
rideoutcyclesinc maybe?

I am 90 miles south of Tampa. When I play I am at Bradenton
I don't know them but I have heard of them on e-bay.
Why do you ask?

[blowerbike]

they sale GS parts/ race parts on ebay.
after i posted i seen that you wasn't him.
i was just curious.

[stetracer]

LOL! Me selling parts OH! you crack me up.
I hardly ever sell parts I buy the crap out of them. Ok I do sell a few parts once and awhile but not very often. But I do Motor work and port heads out of my garage to recoop some of the cost of my bike habit. All my running bikes have my heads on them. I have gotten pretty good at it. over the years. And how can you take credit on how fast the motor goes if your not the one porting the head and tuning it. The head is where most of the power is made.

[trippivot]

hemi's are the best.

2 valve is the BEST for unlimited all out power - no compromises hemispherical dome . MTC vortex and vortexII headded 1700++ cc engines that make near 400 HP naturally aspirating - little wasteful at lower rpms but makes up for it when full on!

- bottom line - more friction - but has stronger components and less moving parts. longer lasting head also like 850/1000/1100


4 valve has better "low lift" flow. more efficient / more power from smaller engines. peppy and streetable , cleaner combustion burning more %'s of intake charge at idle thanks to TSCC .

bottom line--less friction - less stress - lots of delicate moving parts.

gsxr on top of gs - well my opinion is this = if it was the most trick set up, a lot more of us would be doing it.

with very little work a 1150 head can make 100 cfm thru 28.5/24 valves @ .400 lift. From this point a tiny set of .348 "drop in" camshafts installed on top of 1327 OR 1428 cc engine you can create 200+ HP easily.

With a lot of work you can get a GS1100 big port head to flow 110cfm@ .500" thru 42/38 and .480/.395 cams.. Now with that you can crush twist mangle any 8V 64.8mm crank and cases..

I changed to 16 valve after I found the mechanical limits of short stroke 8 valve suzuki engines. --bigger than 1238cc and you are messing with fire.

[Mekanix]

When you guys build the larger CC engines what do you do to make up the combustion chamber volume?
Or what do you do to lower the compression ratio?