Single pattern vs Dual pattern Cams

Well Guys lets move to something alittle different. Does anyone have any thoughts on Single pattern cams Vs. Daul pattern cams?:woohoo:

Ok I'll bite.

What are single and dual pattern cam? Intake and exhaut lobes different on the same cam?

Buzz

OK, I'll be your' Huckleberry too. perhaps 4 valve as opposed to 2 (as in Suz. TSCC head?) or perhaps Honda's V-tec variable cam lobes, G

I had read on the net that VHR asked the NHRA for permission to use a 4 valve head. Back in the day when VHR was running the 2 valve Suz. Everyone went to the NHRA and perposed the 4 valve Suz. head. They said it would not produce any extra power.(HaHaHa) It said VHR perposed the 4 valve V-Rod head for approveal. It said that they got the okay. And the Suz. guys were crying. They wanted to know where they would get an extra 30-40 horsepower?
This is what I read, Take it for what it's worth........

Single and Dual pattern cams can be used as a tuning tool.

Single pattern cams - both have the same lift and duration on the Intake & Exhaust cams. Generally speaking a single pattern cams produce more Torque. They are used when Intake flow is = to the Exhaust flow.

Dual pattern cams - have different lift and duration on the Intake & Exhaust cams. Dual pattern cams can be used in a couple of ways. Say you had a restricked intake system, with a good flowing exhaust system. You might want a cam with more intake lift or duration. If you had a motor with a good intake system and a restricked exhaust. You might give it more on the exhaust side. (Look at what the Z's are)
Then there are some guys that use bigger lift and duration on the intake side and smaller on the exhaust. They do this small on the exhaust because the exhaust valve is open when the piston is on it's way up. If use lose control of the exhaust valve, it hits the piston.
These cams can be used to produce high RPM horsepower.

This is what I know. (Which is probably not much)On most of our vintage stock fours, the intake cam is timed differently than the exhaust cam. If you take a look at the Web-Cam sight for example, (I am talking about the WebCam with the Camsafts, and not the one with some little tart doing some funky dance in front of her computer)You will notice that all with the exception of the "Dwarf Car" cams are the same cams for intake and exhaust. This is because for more tork at lower end you want shorter exhaust duration. I also know that the Yoshimura "Bonneville" cams in my Z1-R are that way .385 intake and .360 exhaust. these cams are from 1978/79 I used to run consistent 10.87s and a top speed of 139mph after 1/2 mile. this was with some mild head work 29 smoothies and a RC1103 kit.

i googled "dual pattern cams" and got a site with mustang car guys talking about flow #'s and car stuff??????

I think when you are talking about this "dinosaur" technology in most of our US made V-8 with the single straddle cam, "Dual pattern" just makes it sound Hi-Tec. when you have DOHC and you can do individual adjustments and tweaking it just becomes "old hat" and you don't even think about the restrictions of a single cam buried somewhere in the bowels of your engine. I would like to have a race with some "Mustang jock" in doing cam swaps. I think I could swap out cams on all eight of my bikes in the time he could do it on his little mustang.

I may be wrong, but I think I remember when the GS and KZ's were the Heavy Hitters in the 1/4 mile, 2 valvers were allowd a couple hundred extra cc's in class. If I could get the poke My gs1100/1164 has out of my KZ1000 just by swapping heads/cams/portwork, I'd be on it like stink on poo.G

You can, The best article I know of was in the 11/1978 "Cycle World" It was called "Taking it to the Tens" Today you can do much better. You can put a "J" or better yet a GPz head on the earlier engines and with a set of mild cams get 130 ponies.

Otakar, Thank-you. I had heard conversions were possible, But was under the impression that there were differences with cyl stud locations. a task I feel beyond me.perhaps mor3e research is in order. G

NOPE, head will drop right on, You will just have to install an APE cam chain idler wheel in the head since the newer head uses a different chain guide system. This part is not much work at all here is a link that should help you. www.flowbenchtech.com/porting/CRH/kz-data.htm You can also look at my project on this sight.
kzrider.com/index.php?option=com_kunena&...w&catid=11&id=169462
I think that we hi-jacked this thread Wez-Bad:blush: we should shift this to a different thread
Otto