I'm in the process of installing a 5 inch camden supercharger on my 81 GS. I've had the supercharger for about 12 years without installing it, I bought it from mazdatrix when they stopped selling camden supercharger kits and it came with no oil injection linkage. My car has a 13b streetport engine with many other modifications. It only has about 25k miles on the rebuilt engine. I'm planning on running the same racing beat/ holley 600cfm carb that has been on it, will rejet for richer mix. I posted here because I'm new to this forum and it won't let me post elsewhere due to my lack of posts. If anyone has any thoughts on how to set up my oil injection linkage please let me know. Thanks

 

Have you ever thought of Premixing the Gas with 2 stroke and getting rid of the oil injection system?That way you don't need to worry about the linkage at all.

 

I've been trying to avoid that because it's such a pain in the ***. The gas tank is never completely empty, so unless you are mixing 5 gallons of gas at a time you can never really be sure of your mix. It would work fine for racing, but not very well for any kind of distance driving. I may have to resort to mixing until I can figure out some kind of linkage.

 

If you can't figure it out I suggest just to premix as well... its not that big of a deal at all.

 

I've seen people rig up a short piece of bike cable to actuate the pump. This way you could route it around any obstructions, and still have it work.

 

That's what I've been thinking too, I have a set of bike brake cables that I'm going to try to use. I was just hoping to hear from someone who had done it.

 

I've done the bike brake cable thing. It works fine, but you need some way of holding it in place. I always had issues with slipping cables due to hot engine bay temps making the rubber outer jacket soft.

 

Camden used to just recommend wiring the omp about 40% open full time. Personally though, having run the camden for so many years I recommend nothing but premixing. Premixing really helps with lubricating and sealing the teflon strips (much like the rotors apex seals) in the charger. PM me for more advice! I can help you pre-tune your carb including jetting, power valve selection and secondary spring selection. Timing and routing of the vacuum source for the brake booster and distributor are another thing too! And air cleaner selection is sooooo vital as well! (hood clearance is an issue, don't be the next victim of a carb stud dented hood). Then there is pulley selection too.

 

Premixing is not a totally complicated science, I find 1/2 liter per full tank. Sooooo, if you need a 1/2 a tank that 250ml is great. Get premium low smoke oil as well. By following this your engine "always" gets proper lubrication and 2 stroke is gonna be better than hot motor oil by far.

 

you can see in the pic I have a holley universal dashpot, this is another item you would benefit from as well.

 

It looks like you have rotated your carb 90 deg from the usual positioning of a holley on a RX7. I had wondered about doing this to avoid the issues with loss of fuel flow with hard cornering due to the float bowls being to the sides instead of fore and aft. I'm planning on using a spectre performance low clearance plenum to build a cold air intake setup. My camden came with two pulleys, the -9 and -10 which are probably rather small for a stock compression engine. I ordered the -7 and -8 sizes last week thinking that I would probably be better off with the lower boost. I've pretty much decided to go with premix and block off the omp, I can use two stroke oil for my mix and go to synthetic in my engine. Your car looks good, love the color.

 

It looks like you're running your vacuum advance off of the manifold, you must be doing this to prevent vacuum advance while on boost?

 

Don't!!! I tried a k&n plenum and even without the filter it fell on it's face at 6000 rpm. Total waste of money. Others have tried and failed as well. The carb plenum is really intended for blow through applications and does not flow well enough on a high volume carb. Boost from the blower is totally dependant on input from the carb.
This was it, check out the massive filter and it still fell on its face!




Just go with a cheap chrome 9" air filter to start. When the budget permits get a k&n filter for it and the a k&n filter lid and you're good to go with no hood clearance issues. I have tried many different air filter arrangements, my two favorite are the 9" k&n for under hood clearance and of course the scoop for the cold air functionality and the head turning effects.




The -7 will bring the boost late and kill some midrange, I found the -7 ideal for the 7" but the -8 is more favorable for the 5".

How much boost are your currently seeing?

Great choice!

Thanks, it is Range Rover Rimini Red with Gold Pearl added to the final stage before clearcoating. Color was close enough to stock that I didn't bother with the door jambs. I also had a stock hood painter so I can run without the scoop.

 

I did this so the butterflies would function on the scoop properly. If you want to eliminate the fuel slosh problem go with an edelbrock. If you stay with the holley then you just need side hung floats.

One more thing, change to a 2.5 powervalve in your holley!

 

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The -7 will bring the boost late and kill some midrange, I found the -7 ideal for the 7" but the -8 is more favorable for the 5".

How much boost are your currently seeing?


I haven't finished putting it together yet, I have brakes to fix and a lot of other maintenance issues. I need some heat in my garage and I've only been working on it on nice days. Right now I need to get out there and lift the motor high enough to get the oil pan off so I can get the oil return from the blower installed.