Author Topic: CycleX drag head... (Read 5977 times)

MRieck · « **on:** February 10, 2012, 03:03:18 PM »

Scroll down a little, click on the pics and check out this head. Serious work. ie different valve angle, really big valves etc etc. http://www.cyclexchange.net/Machine%20Work%20&%20Services.htm

simon#42 · « **Reply #1 on:** February 10, 2012, 03:32:31 PM »

yes plenty has gone on there . the question is though will it work ? heads that look the fastest on the bench never seem to be the fastest on the track .

Jim F · « **Reply #2 on:** February 10, 2012, 03:41:25 PM »

Looks Like they inserted the intake side and welded everything in.
Nice looking welds

Retro Rocket · « **Reply #3 on:** February 10, 2012, 03:57:12 PM »

Mike, did you have any input in this head design..? And what are your thoughts on it..?

jweeks · « **Reply #4 on:** February 10, 2012, 04:00:05 PM »

If my memory is correct, that motor needs to be sub 8.90's on gas to be the quickest ever. Don't remember the name, but he had clutch problems harnessing the power. Something around 77mm bore and a Plus 8mm stroke to give you around 140 horses would be my ultimate guess. I'd use a really light rider in an aftermarket chassis. I wish them luck!

Jon Weeks

Bill/BentON Racing · « **Reply #5 on:** February 10, 2012, 05:40:33 PM »

What size are those intakes? WOW,they are large!!! Want to see finished head bad. Crank prices and tranny work looks appealing!! Like the undercut and coating. Good Luck Ken,keep us posted please.Bill

bwaller · « **Reply #6 on:** February 10, 2012, 05:51:07 PM »

A lot going on there for sure. Those straight shot intakes are a big deal.

MRieck · « **Reply #7 on:** February 10, 2012, 05:53:12 PM »

Well below the sub 8.9 is expected BUT I do not recall anybody in the 8's on a NA CB750. I know Stetson was under 9.2 (9.17 I think) and his bike was the quickest CB at one time. Anyway....who cares. Whatever people were using about 35 years ago does not compare to what is available now. Rods, carbs, valves, piston design/materials etc, etc are all different and much better. Unfortunately a lot of the inherit weaknesses in the engine design still exist.
As for the design Mick...I have spoken with Ken about it and compared what others have done in the past. I have had some input in regard to some valvetrain stuff and some port stuff. It's a drag engine...you are basically concerned with how much compression you can build into it and how much charge can I get into the cylinders in a nano second. I'm more interested in the compression part as it is difficult to get big compression #'s into these things (when normally aspirated). We will see.....at least Ken is serious instead of talking a bunch of BS (all to common).

BLUE71TURBO · « **Reply #8 on:** February 10, 2012, 05:57:56 PM »

$ 2800.oo For the head !! ? Not me. I'd rather have a MRieck head and his custom cylinder block !

Retro Rocket · « **Reply #9 on:** February 10, 2012, 06:03:03 PM »

Quote from: MRieck on February 10, 2012, 05:53:12 PM

Well below the sub 8.9 is expected BUT I do not recall anybody in the 8's on a NA CB750. I know Stetson was under 9.2 (9.17 I think) and his bike was the quickest CB at one time. Anyway....who cares. Whatever people were using about 35 years ago does not compare to what is available now. Rods, carbs, valves, piston design/materials etc, etc are all different and much better. Unfortunately a lot of the inherit weaknesses in the engine design still exist.
As for the design Mick...I have spoken with Ken about it and compared what others have done in the past. I have had some input in regard to some valvetrain stuff and some port stuff. It's a drag engine...you are basically concerned with how much compression you can build into it and how much charge can I get into the cylinders in a nano second. I'm more interested in the compression part as it is difficult to get big compression #'s into these things (when normally aspirated). We will see.....at least Ken is serious instead of talking a bunch of BS (all to common).

Thanks Mike...

Bill/BentON Racing · « **Reply #10 on:** February 10, 2012, 07:17:11 PM »

Retro,Head and cylinder,well yeh,Mike KNOWS his stuff,Ken ALSO, I have A Mike Rieck Stage III CB750K head.....will go on Calendar Girl down the road......but me point is $2800.00 not out of line,easy to spend close to $2000.00 w/out 5mm kit,with it over $2000.00(general terms,Mike very fair),that head looks way AHEAD to me!!
I see $2800.00 as a good deal,you go Ken!

,Bill

dragracer · « **Reply #11 on:** February 10, 2012, 10:29:54 PM »

Quote from: bellcow54 on February 10, 2012, 07:17:11 PM

Retro,Head and cylinder,well yeh,Mike KNOWS his stuff,Ken ALSO, I have A Mike Rieck Stage III CB750K head.....will go on Calendar Girl down the road......but me point is $2800.00 not out of line,easy to spend close to $2000.00 w/out 5mm kit,with it over $2000.00(general terms,Mike very fair),that head looks way AHEAD to me!!
I see $2800.00 as a good deal,you go Ken! ,Bill

Ok fellas, let me put this one in prospective, i had a head porter in Pottstown do the head on my Kaw a few years back. Straight spigots, 8 valve head with all titanium oversize valves and big seats, dual plugged with bridges. It ran me $4500. Now if i was seriously considering doing a high horsepower SOHC for drag racing, would i spend $2800 on that head?- hell yes. A head with lesser modifications than mine from Paul Gast runs $3500 plus without all titanium valves and they're smaller as well. Is my bike quicker than a similar Gast setup? Yes, but i paid extra to go faster-lol. A big bore is great but the power comes from a great flowing head. Thats where you should spend your most money in my opinion. Ahhh, and yes, we need to add compression to that equation as Mike pointed out. Good head, high compression and a small bore works all day long.

dragracer · « **Reply #12 on:** February 10, 2012, 10:35:37 PM »

By the way, i'm fairly certain that these guys are not the first to modify the intake spigots.

H2Eric · « **Reply #13 on:** February 11, 2012, 03:55:52 AM »

Quote from: BLUE71TURBO on February 10, 2012, 05:57:56 PM

$ 2800.oo For the head !! ? Not me. I'd rather have a MRieck head and his custom cylinder block !

I'm sure there is a little more than $2800 worth of work gone into the head shown on the CycleX website. If it's going to go on the fastest and quickest Honda SOHC drag bike then it's going to have to run in the 7's and low 7's at that. Still with the effort that's going into it, whack on a supercharger and slosh in the nitromethane it should be well on its way. I also subscribe to the theory of using a lightweight rider (any offers?) and making the whole bike as light as possible within the constraints of the likely power output. Some of the current top fuelers around today look like they could go on a diet, not to mention some of the riders - no offence. I wish CycleX all the luck in the world, should be a real interesting project.

Eric

754 · « **Reply #14 on:** February 11, 2012, 11:30:12 AM »

One would certainly hope you could go faster or quicker today, than back in the day..

There seems to be a lot of so called "improved" parts around, but whis beating them old times ?

MRieck · « **Reply #15 on:** February 11, 2012, 05:07:32 PM »

Quote from: H2Eric on February 11, 2012, 03:55:52 AM

Quote from: BLUE71TURBO on February 10, 2012, 05:57:56 PM
$ 2800.oo For the head !! ? Not me. I'd rather have a MRieck head and his custom cylinder block !

I'm sure there is a little more than $2800 worth of work gone into the head shown on the CycleX website. If it's going to go on the fastest and quickest Honda SOHC drag bike then it's going to have to run in the 7's and low 7's at that. Still with the effort that's going into it, whack on a supercharger and slosh in the nitromethane it should be well on its way. I also subscribe to the theory of using a lightweight rider (any offers?) and making the whole bike as light as possible within the constraints of the likely power output. Some of the current top fuelers around today look like they could go on a diet, not to mention some of the riders - no offence. I wish CycleX all the luck in the world, should be a real interesting project.

Eric

Eric...he's looking to be the quickest NA CB750....Kenny isn't interested in turbo or supercharging.

MRieck · « **Reply #16 on:** February 11, 2012, 05:13:21 PM »

Quote from: 754 on February 11, 2012, 11:30:12 AM

One would certainly hope you could go faster or quicker today, than back in the day..

There seems to be a lot of so called "improved" parts around, but whis beating them old times ?

Lectron carbs are certainly one improvement. Nobody runs really built CB750's Frank...that's why those old times still stand brother. Just those guys on those funny CB's....I think they call them a u t o m a t i c s.

H2Eric · « **Reply #17 on:** February 12, 2012, 05:03:52 AM »

Mike
No supercharger

Still, there's less chance of spreading the engine all over the place without one. Do you know if the aim is to use common or garden gas (petrol) or something a little more exotic.

Methanol perhaps?

Eric

simon#42 · « **Reply #18 on:** February 12, 2012, 07:11:45 AM »

being the fastest n/a cb750 sounds like a good goal , dont talk about automatics though mike , the side effects of riding one are terrible . i saw an auto rider once , he had shrunk and all his hair had fallen out .

Sam Green Racing · « **Reply #19 on:** February 12, 2012, 07:25:36 AM »

Quote from: MRieck on February 11, 2012, 05:13:21 PM

Quote from: 754 on February 11, 2012, 11:30:12 AM
One would certainly hope you could go faster or quicker today, than back in the day..

There seems to be a lot of so called "improved" parts around, but whis beating them old times ?
Lectron carbs are certainly one improvement. Nobody runs really built CB750's Frank...that's why those old times still stand brother. Just those guys on those funny CB's....I think they call them a u t o m a t i c s.

It's a good job I have thick skin with

Sam Green Racing · « **Reply #20 on:** February 12, 2012, 07:27:00 AM »

Quote from: simon#42 on February 12, 2012, 07:11:45 AM

being the fastest n/a cb750 sounds like a good goal , dont talk about automatics though mike , the side effects of riding one are terrible . i saw an auto rider once , he had shrunk and all his hair had fallen out .

mates like you lot.

Sam.

jweeks · « **Reply #21 on:** February 12, 2012, 02:55:53 PM »

I asked over on Dragbike.com. Latest answer was Gary Pena's pro stock broke into the 8's way back when. I remember the clutch ad and the times that it ran more than who was the owner. Maybe my memory isn't totally gone..... yet?

Jon Weeks

lucky · « **Reply #22 on:** February 12, 2012, 04:17:57 PM »

They just need a 100 lb rider.

Old Scrambler · « **Reply #23 on:** February 12, 2012, 04:28:07 PM »

Ken runs a similar head on his AHRMA road racer............and the light rider better be made of mostly muscle to hold on..........

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Author Topic: CycleX drag head... (Read 5977 times)