Author Topic: porting: spare heads wanted (Read 4478 times)

paulages · « **on:** January 02, 2008, 08:21:52 AM »

i'm about to begin learning the art of porting. anybody got any extra heads laying around they want to donate or sell me cheap?

shoemanII · « **Reply #1 on:** January 02, 2008, 09:20:07 AM »

pm sent today,
bobp

cbass*gxc · « **Reply #2 on:** January 02, 2008, 10:03:38 AM »

Is this what you want? If so you can have these for the price of shipping.

paulages · « **Reply #3 on:** January 02, 2008, 10:10:30 AM »

yes, that oughta do. PM coming your way.

Big Jay · « **Reply #4 on:** January 02, 2008, 05:47:32 PM »

You gonna port that cylinder block?

Sam Green Racing · « **Reply #5 on:** January 02, 2008, 05:50:20 PM »

MRieck · « **Reply #6 on:** January 02, 2008, 07:16:52 PM »

Quote from: Big Jay on January 02, 2008, 05:47:32 PM

You gonna port that cylinder block?

You just couldn't resist could you.

Sam Green Racing · « **Reply #7 on:** January 02, 2008, 07:20:20 PM »

NO NO NO

sorry Paul

Sam.

scunny · « **Reply #8 on:** January 02, 2008, 08:10:57 PM »

you could make that cylinder block a 2 stroke

Sam Green Racing · « **Reply #9 on:** January 02, 2008, 08:15:49 PM »

spose you could saw it into two and have 2 two strokes

paulages · « **Reply #10 on:** January 02, 2008, 11:09:25 PM »

Quote from: Big Jay on January 02, 2008, 05:47:32 PM

You gonna port that cylinder block?

them's some mighty big ports.

Sam Green Racing · « **Reply #11 on:** January 02, 2008, 11:15:35 PM »

yal need some mighty big carbs Paul

paulages · « **Reply #12 on:** January 02, 2008, 11:17:52 PM »

Quote from: SamCR750 on January 02, 2008, 11:15:35 PM

yal need some mighty big carbs Paul

i was planning on bolting up four holly four-barrels. wait til you see the cylinders i'm using!

Terry in Australia · « **Reply #13 on:** January 03, 2008, 01:17:53 AM »

Is Big Jay on vacation?

cbass*gxc · « **Reply #14 on:** January 03, 2008, 06:41:00 AM »

So do you actually port the head and not the block?

dustyc · « **Reply #15 on:** January 03, 2008, 06:50:54 AM »

Yup. You're trying to optimize the flow of the gas/air mixture and exhaust through the combustion chamber. You do it by altering the intake and exhaust ports in the head.

cbass*gxc · « **Reply #16 on:** January 03, 2008, 06:55:25 AM »

Ya so I knew that!

Just wanted to keep you guys on your toes and make sure you actually knew what you were talking about.

So what is it called when you put bigger pistons in the block?

And paul do you still need this block?

rbmgf7 · « **Reply #17 on:** January 03, 2008, 08:23:42 AM »

i was wanting to give porting a shot as well. i have 2 spare junk 77/78 heads to practice on. what tools would you use? i have black&decker variable speed dremel and i stumbled across a port/polish kit on jegs for $30. the kit is just different size and grit sanding drums made for dremels.

mgmuellner · « **Reply #18 on:** January 03, 2008, 08:46:37 AM »

Quote from: cbass*gxc on January 03, 2008, 06:55:25 AM

So what is it called when you put bigger pistons in the block?

Boob job?

paulages · « **Reply #19 on:** January 03, 2008, 08:50:21 AM »

Quote from: cbass*gxc on January 03, 2008, 06:55:25 AM

Ya so I knew that! Just wanted to keep you guys on your toes and make sure you actually knew what you were talking about.

So what is it called when you put bigger pistons in the block?

And paul do you still need this block?

i guess i assumed you knew which was the head, and was actually gonna send that to me.

it's on the left in the picture, with the exhaust studs hanging out. i don't need the cylinders. bigger pistons in block is called overboring.

pdxPope · « **Reply #20 on:** January 03, 2008, 09:51:34 AM »

Quote from: mgmuellner on January 03, 2008, 08:46:37 AM

Quote from: cbass*gxc on January 03, 2008, 06:55:25 AM
So what is it called when you put bigger pistons in the block?

Boob job?

Wrong thread....

-JP

cbass*gxc · « **Reply #21 on:** January 03, 2008, 12:46:54 PM »

Ya sorry about that. I am still a little ignorant when it comes to engines. But that is why I bought this bike, so I can learn. Man I feel like an idiot.

And to mgmuellner.....A boob job is when you put bigger blocks in the pistons.

dusterdude · « **Reply #22 on:** January 03, 2008, 01:34:00 PM »

cbass,dont feel so bad,the only idiots on here are k8 owners.

Big Jay · « **Reply #23 on:** January 03, 2008, 03:47:43 PM »

Quote from: Terry in Australia on January 03, 2008, 01:17:53 AM

Is Big Jay on vacation?

What's a vacation???

If you really want to learn to port heads, forget the Dremel. Get an air grinder with 1/4" chuck. They are now pretty cheap thanks to our friends in China.

Youwill need sone long shank carbide cutters. For the abrasives to finish up, http://www.sa-motorsports.com/

Jay

Hockers Choppers · « **Reply #24 on:** January 03, 2008, 03:53:29 PM »

If You are going to use the head after porting, please save the trouble and liver and have a pro port Your head!!!!! You will most likely loose HP! This IS brain surgery and rocket science put together!!

Terry in Australia · « **Reply #25 on:** January 03, 2008, 03:54:45 PM »

Can I use an electric 1/4" die grinder Big Jay? My air grinder is a noisy sucker...............

Big Jay · « **Reply #26 on:** January 03, 2008, 05:11:39 PM »

Quote from: Terry in Australia on January 03, 2008, 03:54:45 PM

Can I use an electric 1/4" die grinder Big Jay? My air grinder is a noisy sucker...............

I thought that was what I Pods were for

You can use the elect as long as it has decent rpm.

Jay

Terry in Australia · « **Reply #27 on:** January 03, 2008, 05:24:57 PM »

Do the abrasive "drums" clog up with aluminum? I grind aluminum bases for my Suzuki oil cooler adapters with a belt linisher and 7 inch disc mounted on a pedestal grinder, and I have to use a "dry lube" stick to stop the abrasive from clogging up with aluminum particles, is that a problem with the grinding drums on an air grinder too?

MRieck · « **Reply #28 on:** January 03, 2008, 05:37:59 PM »

Quote from: Terry in Australia on January 03, 2008, 05:24:57 PM

Do the abrasive "drums" clog up with aluminum? I grind aluminum bases for my Suzuki oil cooler adapters with a belt linisher and 7 inch disc mounted on a pedestal grinder, and I have to use a "dry lube" stick to stop the abrasive from clogging up with aluminum particles, is that a problem with the grinding drums on an air grinder too?

If you spin the burr to fast it will heat the suface of the aluminum and surface harden it. It will create ripples which can be a PITA to remove. I use a Foredom electric unit with variable speed foot control. It's quiet, has a lot of torque and offers great control.

Terry in Australia · « **Reply #29 on:** January 03, 2008, 06:08:47 PM »

Is this the one Mike? Looks good!

MRieck · « **Reply #30 on:** January 03, 2008, 06:15:20 PM »

Quote from: Terry in Australia on January 03, 2008, 06:08:47 PM

Is this the one Mike? Looks good!

Bingo Terry.

paulages · « **Reply #31 on:** January 03, 2008, 06:45:38 PM »

Quote from: Hockers Choppers on January 03, 2008, 03:53:29 PM

If You are going to use the head after porting, please save the trouble and liver and have a pro port Your head!!!!! You will most likely loose HP! This IS brain surgery and rocket science put together!!

true, but both rocket science (my dad actually is a rocket scientist

) and brain surgery can be learned. luckily there is an abundance of good information on the subject, and both mike rieck and my machinist (he's been porting since before the 750 was even dreamed of, and has done lots of cb750 heads since the '70's) have been quite helpful with the tips. i have a 650 head at the shop that mike did, which ought to make a good reference.

i bought an assortment of 6" shank, double cut carbide burrs from a local tool supply.

mike: what type of wax do you recommend? when dan was showing me his porting area and giving me some tips, he had both a candle and some sort of wax in a tube that he uses in the burr while grinding.

MRieck · « **Reply #32 on:** January 03, 2008, 07:18:12 PM »

The porting wax in a tube though to be honest I don't use it a lot with aluminum. I run the bit slower and take smaller cuts which doesn't clog the burr. I do use a little bit with the heavy fluted burrs to remove material quick. The 6" shanks are long Paul and the longer the bit the less controll. I've found 4" to 4.5" works on just about every bike port I've encountered. Car stuff is different....you need long bits. The good thing about the 6" shank is you can cut them down to whatever length you want.

Terry in Australia · « **Reply #33 on:** January 03, 2008, 07:25:56 PM »

Hey Mike, hows about a pic of the range of burrs you use, so I don't go buying the wrong ones? Cheers, Terry.

MRieck · « **Reply #34 on:** January 03, 2008, 07:27:50 PM »

Quote from: Terry in Australia on January 03, 2008, 07:25:56 PM

Hey Mike, hows about a pic of the range of burrs you use, so I don't go buying the wrong ones? Cheers, Terry.

It will have to be tomorrow mate. Bedtime now.

paulages · « **Reply #35 on:** January 03, 2008, 10:59:49 PM »

Quote from: MRieck on January 03, 2008, 07:18:12 PM

The porting wax in a tube though to be honest I don't use it a lot with aluminum. I run the bit slower and take smaller cuts which doesn't clog the burr. I do use a little bit with the heavy fluted burrs to remove material quick. The 6" shanks are long Paul and the longer the bit the less controll. I've found 4" to 4.5" works on just about every bike port I've encountered. Car stuff is different....you need long bits. The good thing about the 6" shank is you can cut them down to whatever length you want.

yeah, i thought the 6" burrs might be a little long, but they didn't have anything in between 2.5" and 6". i'll try 'em and keep looking for more once i know what they feel like. they were half the price of the place in tennessee you told me about at least.

Jim F · « **Reply #36 on:** January 04, 2008, 05:13:15 AM »

If you talking 2 stroke then just mill some transfer ports and make some cut outs for
read blocks and make a killer K750TZ
ring ding ding ding ding..............

I might have some heads you can mess with after Mike
checks them out to see if there anygood

Jim

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Author Topic: porting: spare heads wanted (Read 4478 times)