Author Topic: Drouin Supercharger (Read 24517 times)

jpswino · « **Reply #25 on:** September 03, 2010, 08:36:36 PM »

So as I am preparing the 836 motor for a test run I discover before installing the valve cover while setting the valves that there are serveral stripped cam tower bolts! WTF! I am not a happy camper.

So I guess I'll try the Drouin out on the 1000 motor. So I pulled out a few parts I have been gathering like a shaved valve cover and custom tappet covers. Rounded up a few other covers and mocked up the Drouin to see what it all will look like. Gonna run it tomorrow hopefully. Gotta install the Dyna and a few other covers still besides sort out the Drouin stuff.

Just a mock up for a visual

scottly · « **Reply #26 on:** September 03, 2010, 08:39:44 PM »

Whoa, some big misconceptions about superchargers going on here! First, all superchargers are indeed air compressors. That's were the boost comes from. Whether Roots, screw (modified roots; still positive displacement), centrifugal (turbo, Drouin, Pro-charger) or vane (Judson), they all pack more air into a motor than it can inhale at atmospheric pressure, by compressing it into the intake. Also, whenever air is compressed, it heats up, regardless of the type of compressor. (Although some types are more efficient that others.) This is why inter-coolers are used to cool the intake charge.

Ricky_Racer · « **Reply #27 on:** September 03, 2010, 09:00:10 PM »

Joe, Denis didn't seem overly concerned about the slide not closing due to intake pressure; he said "Just be sure you know where the kill button is....".

I did ask him if replacing the return spring with a heavier one would be a good idea and he supported that change.

After reviewing some of the info in the previous links, Joe, you may find some issues you need to consider, like the cost of two ceramic bearings. I'm going to be looking for a non-ceramic high-speed bearing alternative.

Yes, Scottly, Boyle's Law tells us that temperature increases with pressure, but all the info I've gotten suggests that centrifugal superchargers like the Honda Drouin don't produce as much heat as the Roote's type. Although I don't as yet have any empirical data to support that position, could it not possibly be related to the higher pressures possible in a Rootes design? RR

jpswino · « **Reply #28 on:** September 03, 2010, 09:17:46 PM »

Cool thanks RR. Gonna put the spring replacement on the top of the list.

So are you running a single pod on the intake side of the injector? Looks like a simple K&N pod filter will fit right on there under the manifold. Gotta run it through some kind of filter right?

Maybe a foam one would be less restrictive? Is there good suction there that I need to consider?

scottly · « **Reply #29 on:** September 03, 2010, 09:19:27 PM »

Quote from: Ricky_Racer on September 03, 2010, 09:00:10 PM

J

Yes, Scottly, Boyle's Law tells us that temperature increases with pressure, but all the info I've gotten suggests that centrifugal superchargers like the Honda Drouin don't produce as much heat as the Roote's type.

Yes, I think centrifugal chargers are more efficient, and don't cause as much heat for a given boost level, but I also have no empirical data on hand to back that up.

scottly · « **Reply #30 on:** September 03, 2010, 09:26:30 PM »

I would like to see a picture of the injector.

jpswino · « **Reply #31 on:** September 04, 2010, 06:02:54 AM »

Oh I think that can be arranged.

traveler · « **Reply #32 on:** September 04, 2010, 07:55:09 AM »

I have a centrifugal supercharger on my Mustang. I builds boost up in relation to RPM. they are able to function properly through gear reduction in the head unit.

Like the shaved valve cover BTW.

~Joe

jpswino · « **Reply #33 on:** September 05, 2010, 06:25:13 PM »

So here are some pics of the fuel injector. If I am understanding what I am looking at then my rig has already been altered for push and pull. Check it out.
You'll notice the first pic where my finger is pointing I believe is the pull hole and must connect somehow to that little hole there on the inside of the slide. Then the second hole on the other end has been set up to hold a classic barrel end of a throttle cable. And you see in the last pic my thumb pushing the slide against the springs to open half way.
If I understand correctly it looks like the rod down the middle of the slide which is inside a fine tube is tapered and as it opens the taper allows more fuel to come out.

Bill/BentON Racing · « **Reply #34 on:** September 05, 2010, 06:33:36 PM »

Yes,it is.You just need to adapt a B return/push cable.Need fiitting for injector body and I think I used a B cable,just not sure if it was off a CB750. Took a while....but worth it!

,Bill

jpswino · « **Reply #35 on:** September 05, 2010, 07:38:30 PM »

Cool!!!!!!!!!!

What do I install into the slider on the intake side to hold a cable?

I see that little hole there in the end. What goes there to hold the pull cable?

Ricky_Racer · « **Reply #36 on:** September 05, 2010, 07:57:00 PM »

Joe, your pull cable should have a very small brass tip on it. That goes into the small hole and is secured with the 1/8" allen set screw on that end of the injector slide. The other set screw secures the fuel needle. RR

jpswino · « **Reply #37 on:** September 05, 2010, 08:22:54 PM »

RR, I don't have the cables. Do you have a pic of the pull cable attachment you mention?
Or can you scribble down a quick sketch of it so I can fab something.

Ricky_Racer · « **Reply #38 on:** September 05, 2010, 08:42:43 PM »

Tomorrow is going to be busy, Joe, but I'll try to take a couple shots and upload them. I believe Motion Pro might have the specs on the Drouin cable but I'll try to give you as much info as I can. L8R. RR

jpswino · « **Reply #39 on:** September 05, 2010, 08:57:55 PM »

Thanks, Anything is much appreciated whenver it works for you sir.

scottly · « **Reply #40 on:** September 05, 2010, 09:46:21 PM »

Personally, I would run a real carburetor, and save the "injector" as a collector's item. Just my 2 cents....

HB-1fan · « **Reply #41 on:** September 06, 2010, 08:38:18 AM »

Hey guys, great thread!! It's always good to get detailed info for all the rare parts still out there.

RR, you asked about ceramic bearings. You can contact Dave Conforti at http://www.worldwidebearings.com/ he specializes in motorsports bearing and is also a vintage bike nut and racer.

HB

Ricky_Racer · « **Reply #42 on:** September 06, 2010, 08:51:25 AM »

Thanks, HB! I'll get in touch with Dave. I have the bearing numbers and hopefully he has a less expensive alternative than $250 per bearing with two required.

RR

Ricky_Racer · « **Reply #43 on:** February 02, 2014, 11:58:24 AM »

If anyone has a Drouin nameplate from a parts unit - it's the one that says "Drouin" and has a serial number - please let me know. I have a friend with one missing from his assembly and I'd like to help him find one. Thanks! RR

Bill/BentON Racing · « **Reply #44 on:** February 02, 2014, 04:08:27 PM »

Anyone got their's running yet? They are fun. Makes sweet sound, no ear plus here, I loved it!

Bill

Ricky_Racer · « **Reply #45 on:** February 02, 2014, 05:12:29 PM »

Not yet, Bill, but I've started working at it again using my remaining Drouin. IMHO, it's a relatively easy and comparatively inexpensive way to serious horsepower. The Drouin looks pretty fresh but I'm going to go through it with new high-speed bearings and an impeller balanced to 30k RPM. I'm considering running it on an essentially stock CB750 motor with F2 bolts and an RC drive with a Mallory Uni-lite. We'll see if my money and energy run out before my focus does...

BTW, does anybody know of any particular reason that I would want to run low-comp 836 turbo/blower pistons instead of stockers? RR

shpwrk · « **Reply #46 on:** February 12, 2014, 08:10:55 AM »

I have a complete Drouin that I am restoring and plan to put it in a cb750 or 836 10-1. I would like to know if someone had the numbers on the bearings. I count four bearings. Any help with someone who has or is running one of these would be greatly appreciated.

Thank you in advance

23tbucket · « **Reply #47 on:** February 15, 2014, 06:14:18 AM »

https://www.rbracing-rsr.com/compression.htm

Your engine may not live long at 10:1 ?
7:1 or 8:1 is ideal.

Ricky_Racer · « **Reply #48 on:** February 15, 2014, 06:21:42 AM »

Thanks, 23Tbucket! That link is very helpful, especially since I run close to sea level. RR

spiritof67 · « **Reply #49 on:** February 15, 2014, 11:31:59 AM »

This is a great quest and thread, thanks to all. Informative, challenging, cooperative. Now, anybody gonna chime in about the Magnuson and/or the Brit Rootes type superchargers? And that "injector" - looks like a certain early flat slide carb I won't name here....

News:

Author Topic: Drouin Supercharger (Read 24517 times)

jpswino

jpswino

jpswino

traveler

jpswino

jpswino

jpswino

jpswino