Author Topic: New Turbo thread (Read 9187 times)

corky · « **Reply #25 on:** October 06, 2022, 07:14:43 AM »

Interesting to see the differences with them all next to each other.....is that last exhaust header on the right custom made by someone?

Thanks,
Daniel

Don R · « **Reply #26 on:** October 06, 2022, 09:02:06 AM »

Actually, the middle and right are the same except the rear tube is stuck on the APE stocker on right. The spider header has a fabricators tag on it. I'll get a pic today.

Don R · « **Reply #27 on:** October 06, 2022, 05:38:19 PM »

I noticed the plain aluminum (cast black) one has a passage through the bottom of it with 1/4" plugs on the ends, it doesn't appear to merge with the intake tract itself. I wondered if it is intended be a cooler of some sort.
The chunky one has a bigger plenum area for the fuel to turn downward in, the center intake nipples protrude into the manifold a bit, I'm wondering if that is intentional to try to balance flow or just what happened. I'd love to get it on a mill and turn some thick areas into cooling fins. Or in that location would they be heating fins?
The mock-up will be interesting to see if the spider exhaust and billet intake parts are made to fit together.

Don R · « **Reply #28 on:** October 06, 2022, 06:52:15 PM »

Apparently, the fabbed intake isn't a one off made locally. I also have that clutch cover, but the threads are toast. I thought it was a vent, might be the oil drainback hose.

I snagged these pics here on another thread.

Don R · « **Reply #29 on:** October 06, 2022, 08:29:42 PM »

More pics, this shows the one intake with the through hole, it isn't connected to anything except the other end. I guess you could run the fuel through it rather than run a hose over the turbo.
I wish I had more of this ARD wire, I got two long ones and one short one.

corky · « **Reply #30 on:** October 07, 2022, 07:22:03 AM »

Great pictures Don! It looks like you have really accumulated a lot of parts. Can't wait to see you get it on a bike. :-)

is this going on your CB that has the lesters and RC pipe, or a different bike?

Thanks,
Daniel

Don R · « **Reply #31 on:** October 07, 2022, 08:28:22 AM »

Daniel, I bought two bikes and a truck load of parts from the same guy. The other one is a raked frame with an extended swingarm and wheelie bars that this will go on. He had purchased an ATP kit from Pee Wee Gleason's Dad and two other turbo bikes. These are the left-over parts. He said his friends threw away all of their 750 racing parts years ago, but he was saving them for someone that appreciated them. He saw my three 750's at a car show and decided I was that guy.
I did an "I went shopping" thread that shows the score. The PO lives in Metamora and happened to ride his Harley to my car cruise. He was afraid he might be a hoarder and transferred that issue to me. He said he knew if I didn't use the stuff, I'd pass it to someone that would so at some point I'll have the spares to sell.

He did a wheelie back flip on his Hayabusa at Cordova last year. The Honda sale helped fix it.
There are free windjammers in this pic. any member who stops by can have up to three with brackets and pigtail wires. Shipping is an issue.

Don R · « **Reply #32 on:** October 07, 2022, 09:32:50 AM »

I've spent hours searching for ATP Honda information online. It's a shame there aren't any old manuals or parts catalogs to look at. I find an occasional picture of a project bike; one shows the intake with the passage in it not in use.

I already have two F/B sites to babysit, maybe old dragbikes and where are they now would be a good place to ask.

corky · « **Reply #33 on:** October 07, 2022, 10:38:51 AM »

hey Don,

Glad to hear you aren't taking the one bike apart. It really looks good as is! That is really cool how you ran into a guy with those parts....it really is nice to find someone that values them and will use them. I am looking forward to seeing how your build goes.

Thanks,
Daniel

Don R · « **Reply #34 on:** October 08, 2022, 12:25:27 PM »

The facebook guys have some info on the ATP kits but Bill Benton seems to be the go to guy.

MRieck · « **Reply #35 on:** October 08, 2022, 02:27:34 PM »

Quote from: Don R on October 06, 2022, 08:29:42 PM

More pics, this shows the one intake with the through hole, it isn't connected to anything except the other end. I guess you could run the fuel through it rather than run a hose over the turbo.
I wish I had more of this ARD wire, I got two long ones and one short one.

Looks like Taylor wire....maybe made for ARD. You can get the Taylor in red .....it's copper core I imagine.

Don R · « **Reply #36 on:** October 08, 2022, 09:33:36 PM »

It is copper core Mike, fine strand too. I just liked it because it says ARD. I saw several colors of ARD wire while looking at magnetos online.

Don R · « **Reply #37 on:** October 10, 2022, 05:28:05 PM »

I cut four pieces of proper sized silicone intake turbocharger tubing. I wrapped heavy paper over a piece of 1" PVC until it was tight in the hose. Then I sliced four pieces 1 1/8" long, on my powered miter box, just like my weber carb intakes.
When in place, the intake seemed high and when I tried to mockup the turbo it wanted to hit the underside of the frame. I used the spider header and the two header to turbo pipes were different, I decided which one comes closest to fitting and it also appears to flow better with reduced angles.

Link for reference to a turbo thread.
http://forums.sohc4.net/index.php/topic,162696.msg1870731.html#msg1870731

Don R · « **Reply #38 on:** October 12, 2022, 09:23:56 AM »

I ordered the wrap around turbo hose clamps for the small and large hose and a replacement for the rodent eaten larger hose (2 1/4") from Pegasus Racing. I had left over small hose (1 3/8") from my Weber carb project and cut 4 new ones.
I wrapped a piece of 1" pvc pipe with heavy brown paper until it was a tight fit in the hose, inserted it for support, and then cut the 4 pieces in a power miter saw. Otherwise, the blade tends to grab the empty hose and shoot it out the back. I think Frank did something similar on a lathe to cut his weber intake hose.

Old Scrambler · « **Reply #39 on:** October 12, 2022, 10:46:42 AM »

I was just about to mention HIM when you referenced Frank

His family may have his paper stash of manuals

Don R · « **Reply #40 on:** October 18, 2022, 11:28:14 AM »

I miss having Frank's input on these things. The PO said the cast intake is the newer and better flowing than the fabbed one even with the smaller plenum.

Don R · « **Reply #41 on:** October 18, 2022, 07:59:29 PM »

Corky, this is the name plate on the spider header. I've seen 4-1's that wrap all four primaries around to the side before they tie into the collector.

There is also a newer style wastegate. One is in a picture in the high performance parts section around 2018 I think. It's from post #1379 pictured below.

One article I read said tying the wastegate dump downstream of the turbo helps with flow. I'm not sure I get that unless it's the header effect causing a negative pressure downstream.

I now have the intake hoses and clamps for a Weber MPC intake, an ATP intake and the larger turbo to intake hose. The clamps are a worm gear type but are shielded on the back so the slots don't grab the hose.

corky · « **Reply #42 on:** October 20, 2022, 08:01:46 AM »

It looks like you have some really nice parts to work with to build at least one good turbo setup!

Good luck with the build Don, and keep the pictures coming! :-)

Don R · « **Reply #43 on:** October 20, 2022, 08:13:21 AM »

https://rbracing-rsr.com/ It appears RB is still around and making turbo headers.

Wastegate apart for cleaning, when I was done, I found the checkball in the pan. Took it back apart, cleaned some more and re-assembled. I believe the valve (in the black section) is a cut down intake and the piston looks like a brake caliper piston. I didn't remove the valve, it didn't want to come apart and I didn't want to make another gasket.
Here's the turbo too. I lubed it by gravity and spun it with a blow gun. It sounded to me like a small civil defense siren. It spins easier now, I guess it will work.

Don R · « **Reply #44 on:** December 06, 2022, 03:20:32 PM »

Holy Moley, I wrestled the spider header for an hour today. I never did get it on a head. It's the newer style of exhaust clamp with nipples and flanges. #3 and #4 are pretty difficult to line up. The head that was on it seems to be clearanced a little near the studs.
I can see why someone beat on the early style log header I also have. I even made a spreader tool but it moved the wrong tube.
Next move, try it on a head with no studs installed.

NitroHunter · « **Reply #45 on:** December 10, 2022, 08:34:45 AM »

Don I know what you mean, I removed the studs then used stainless allen head bolts. Worked just fine.

Don R · « **Reply #46 on:** December 10, 2022, 11:53:42 PM »

I'm still struggling with it. I may make a set of 3 pipe spreaders.

Also was there a common piston bore size between 64 and 65mm? I have 3 turbo pistons marked RC Eng. 64H they don't fit into a 64mm cylinder and are loose in a 65mm cylinder. Only curious because I only have 3.

dragracer · « **Reply #47 on:** December 11, 2022, 09:33:40 AM »

Quote from: Don R on December 10, 2022, 11:53:42 PM

I'm still struggling with it. I may make a set of 3 pipe spreaders.

Also was there a common piston bore size between 64 and 65mm? I have 3 turbo pistons marked RC Eng. 64H they don't fit into a 64mm cylinder and are loose in a 65mm cylinder. Only curious because I only have 3.

Don,

I know you're trying to make use of the parts you have on hand but MTC had brand new turbo pistons on the shelf a few years ago. I contacted them looking for 72mm high compression SOHC pistons and he told me he still had turbo pistons for 750s. I'm not certain what all sizes he had on hand but maybe call Eric and ask. He gave me a very good deal on the 72mm set.

Don R · « **Reply #48 on:** December 11, 2022, 09:55:28 AM »

Thanks for the heads up. I'll check it out.

newday777 · « **Reply #49 on:** December 11, 2022, 04:28:26 PM »

Quote from: Don R on December 10, 2022, 11:53:42 PM

I'm still struggling with it. I may make a set of 3 pipe spreaders.

Also was there a common piston bore size between 64 and 65mm? I have 3 turbo pistons marked RC Eng. 64H they don't fit into a 64mm cylinder and are loose in a 65mm cylinder. Only curious because I only have 3.

Yes. 823cc 64.5mm

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Author Topic: New Turbo thread (Read 9187 times)