Velocity porting vs. Oldschool porting

[fat_sac]

Not trying to start **** here, but all this anonimity and skirt blowing looks like a bunch of aliases talking someone up. You tell me who you are and I'll tell you who I am?

[Dink]

Not trying to start **** here, but all this anonimity and skirt blowing looks like a bunch of aliases talking someone up. You tell me who you are and I'll tell you who I am?

I am Dink, been here seven years. If you dont know me by now you aint trying.
Dink

[Billy Ricks]

Not trying to start **** here, but all this anonimity and skirt blowing looks like a bunch of aliases talking someone up. You tell me who you are and I'll tell you who I am?

Both these guys seem to know what they are talking about. I can't say I blame them for not posting under their real names.

I am Dink, been here seven years. If you dont know me by now you aint trying.
Dink

I can assure everyone my name really is Billy Ricks.

[BadBillyB]

I am Billy Birch. I am a 51 year old retired semi-pro m/c dragracer. The track announcer at my local track dubbed me "Bad Billy Birch".....I got nothing to hide. I have always done my own cylinder head porting and had good results. I did my homework by reading every article, magazine and book I could get my hands on that had articles on porting techniques. I also used to lurk around the professional racers pit area in hopes of getting a peek into their ports (and I did) Maybe I should have been "SneakyBillyB". I also had friends who purchased big buck pro stock heads from VHR and as soon as they arrived, we examined every detail of the ports....It's the total of all these things learned that make you a good head porter....I saw the mototune pages long ago and left there without learning anything. It only illustrates how to modify the port floor and this mod is "Oldschool" ....Pro Stock bikes were running epoxy in the ports back in the mid 80's....I also made a post a while back about a book I recommended to you all http://www.thegsresources.com/_forum...highlight=bellthat shows how to modify the floor of your m/c intake port w/epoxy. Think it was written in the early 80's.....I was just pointing out that the scope of the mototune site is very narrow. If I thought the mototune guy was a member on this board, I never would have stated my opinion. So, anyway, I'm just an old m/c dragracer that likes to share all I learned over the years racing a old GeeWizzer 1000 .........BadBillyB

[headsbikesmopars]

Smokey used to say "A 747 would have flown 2000 years ago". Smokey had a way with the truth. He often amazed me. I learned very much just watching him. Quite the innovator he was. What he meant by that was just because something is 'old'..dosen't mean it is bad, (time limitation). Works for me. Sorry for the **** , just offering my input..is all. My last post. Heads Bikes and Mopars.

[HiSPL]

I hope nobody got their skirt ruffled here, because I for one wished we had more people like BadBillyB and Headsbikesmopars around here. The way I see it is that hundreds of people raced the big GS's back in the day, but you don't see much detailed technical info here about what they did to win. I want to know what made a winning head, crank, tranny, or whatever.

A good engine design is like a good pizza. There's 100 different ways to do it and most of them produce great results.

I myself am not interested in building a dragbike. I want a hotrod 750 streetbike, however there is much to be learned in the porting of a dragbike head all the same.

Stick around guys, and share your knowledge. There are many here that appreciate it to no end.....

[fat_sac]

Yeah, I didn't mean to upset anyone. I was just kidding. I''ve never even done any head work. I just watch my father do it. I guess that's the ****ty thing about the internet, you can't read ppl's tone through text. I just wanted to know who you guys were.

[Mysuzyq]

Guys like headsbikesmopars, with the wealth of knowledge and info they share is what makes this site so great.....it matters little what their names are, where they are located etc.....I hope you choose to stay and contribute to the GSR, headsbikes !

Tony.

[BadBillyB]

I personally would like Headsbikesandmopars to stick around this site as he seems to know quite a bit. I dont care if he wants to keep his identity private. He has given positive input to this topic and I hope I didn't offend him. Modifying 2V Suzuki motors is my passion but I have gotten too old to race and my hands are too eaten up with arthritis to port cylinder heads. My eyes do not see the things they once could....But, it is still my passion and I would like to share the experience and knowledge that I learned from racing a 2V Suzuki for 10 years.......Before this, it was a highly modified street bike, so I can offer some advise on what worked for me back when it was a street terror..........To get back on topic, I will try and get some new pics of my ports with the valves removed so you can get a better idea of what worked for me.........BadBillyB

[Dink]

Not trying to start **** here, but all this anonimity and skirt blowing looks like a bunch of aliases talking someone up. You tell me who you are and I'll tell you who I am?

So who are you??

Dink

[fat_sac]

So who are you??

Dink

Haha, I'm just Marshall. I don't even know how to work on heads. I just wanted to know who everyone was. I just watch my dad do the headwork for our family and friends.

Like I said earlier, didn't mean to upset anyone.

[RobGS850L]

Headsbikesmopars stirred up a bit of thought. With a name that ends with Mopar got me thinking of the old Max Wedge heads and how they were "old school" type heads. They were huge flat ports that were all top end and no real power any where else. Then in the 80's us Mopar guys saw the advent of some newer heads that were of the smaller port design and flowed really well and showed a broad power band. I'm not saying that bigger isn't always better but sometimes a bit of thought in between might help too. I think useable power verses peak power is what a guy needs to think about when one gets the Dremel out. A small hump of epoxy on the intake runner may give you a smaller port but yet the useable power obtained may benefit you more. I'm enjoying the input for sure. Keep on Billy.

[BadBillyB]

A small hump of epoxy on the intake runner may give you a smaller port but yet the useable power obtained may benefit you more. I'm enjoying the input for sure. Keep on Billy.

On a drag race head, the lump of epoxy is used not to make the port smaller, but rather to turn the gasses earlier before they hit the back of the valve. The added benefit is, it makes the "short side" longer. You want the short side and long side of the port as equal as possible. It also allows you to make the sharpest part of the turn flat in the center, keeping velocity high.......One thing the old GeeWizzers had over the Kaw's back in the day was the valve size. I used to put Suzuki valves (slightly trimmed down) in my friends Kaws as they could only handle a 37.5mm intake (stock 36mm) on the stock seat. The Gs1000 came stock with 38mm intakes!!! No need for valve increase unless you are approaching 1200cc........BadBillyB

[nastyjones]

So, where are all the pics relating to porting the 2 valve motors??

You promised!!! LOL

Paul

[BadBillyB]

Heres a page scan from A, Graham Bells book, complete with my own scribbling. The scribbling is on the right. It demonstrates how the gases flow in a cone around the valve head. Let me know if the image is crappy. I am learnin the ropes......BadBillyB

http://216.77.188.54/coDataImages/p/...rt(Medium).JPG