Lysholm/Whipple/Opcon-Autorotor SR3 3150
 

While browsing the local classified website a few months ago this popped up and at the price I couldn't help but buy it.

Originally sold (to the guy I bought it from) from BahnBrenner Motorsports as an Opcon-Autorotor SR3. But they seem to be known interchangeably as Lysholm, Whipple, Kenne Bell, and Opcon-Autorotor.
Datasheet Can be found here SR3 Supercharger | Lysholm


I've decided to put this on my 99 SSM autox car. It currently has forged rods/pistons (9.5:1)as well as ARP Head studs, as the engine was built for boost. And I've already got a MS3 built by MSLabs running COP (though I may have a line on a MS3 pro ultimate for cheap)

I personally don't like the idea of a hot side mount (especially for how big this charger is) so I am in the process of building a manifold/Aftercooler/SC Mount to replace the factory manifold. I have found a pair of laminova cores that will 1, be able to cool what this SC can put out; and 2, fit in the spacial constraints of a cold side setup.

The plan is
Supercharger mounted just over the runners, blowing past runners and down to the Laminova cores.
Laminova cores at 45deg inlet/outlet and almost side by side, to angle the airflow from downwards to horizontal (away from engine) while cooling the air.
From cores to a plenum area, where bellmouths on the runners are at 45deg from horizontal (downwards) so the air makes, essentially, a 135deg turn after the Cores, and into the runners.
1.75" OD runners 45deg bend right after bellmouths and horizontal into intake flange
custom machined intake flange to go from 10deg upwards oval ports to horizontal circular ports.

I've done a fair amount of 3d drawing (onshape) and 3d printing of the parts to make sure they'll all fit, and should work as I imagine.

So, I guess this post is 2 factored, 1: a question; Those who have built SC miatas, is there any glaring things I'm missing, or do you have any suggestions on mounting,etc?
And 2: a build thread. I'll try to keep the build updated here with pictures and such (probably just a google photos album link) and small updates/questions/issues i'm running into.

Thanks

sneak peak for those who don't feel like going to the album
https://lh3.googleusercontent.com/0l...=w1292-h969-no


Current pics are here in this album https://photos.app.goo.gl/PRGvCtNam4JHD9657

SC
 

Beautiful work.....what HP are you shooting for?

Whipple on the intake side sounds like a nice combo of power & simplicity. Nice work!

Hi Ironhydroxide,

That is a nice looking charger!

You have an Autorotor brother in arms btw - I have just started a cold side supercharger project with the slightly smaller brother of your unit, the SR2 2087.

Looking great so far, keep up the good work!

I need to have a closer look (steal :)) at how you are running your belt, because you seem to have managed to not have to move the alternator!

Is this an internally oiled unit? It looks like it has a fill point / dipstick on the top?

Tom

I've been working on the belt tensioning/routing for a while, there's not a ton of space in the area.
Corona has dropped the amount of extra $$ i have for the project, so I haven't done much more than brain work on it for the last 3 months
I lowered the alternator (cut off the extension on the boss so the alt could pivot more) and part of the SC tensioner mount will be the tensioner for the alt. Just a longer belt and it'll be good.

This charger COULD be an internally oiled, but I am plumbing it into the engine oil setup, feeding it with a bypass filter setup after oil cooler(so the oil gets a bypass filter, and the SC gets the cleanest oil that's been cooled as well) then drainback to the pan.

What's your mount setup like? intercooled/aftercooled? Custom Manifold? I'm curious as to how you setup yours, The smaller charger definitely helps placement of many things. 50mm less depth would make it much easier to build an intake setup on the back, mine will have to be some pretty tight bends.

I won't hijack your build thread, here is a link to my build:
https://www.miataturbo.net/superchar...8/#post1571733
I am right at the start, the charger / chargecooler has been delivered and I have done some fag packet sketches but I know how I'm going to go about it.

What kind of power is the 3150 capable of? Must be 350-400hp surely?

Hope things get back to normal over your way soon so giant supercharger activities can restart!

When you say bypass filter, do you mean one of those small inline filters? Are you going to feed from the top port, drain from the bottom?

Hi mate I had some good information from Hans at HP Hi Flow superchargers in Oz, who have a lot of experience with the Autorotor superchargers, namely on MGB and Mini kits they (used?) to build. Anyway, Hans explained that they had difficulties with engine oil pressure fed lubrication on these chargers. The problem appears to be that even with a restrictor in the feed and a drain of 1/2" pipe size the gear case would fill up too high with oil, generate too much heat and cause issues. The way he was oiling the superchargers on his kits was a closed oil system with a small clear tank that was connected to the drain port and breather. The small tank was mounted level with the desired level of oil in the case. The oil levels out between the case and the clear tank and is easily visible for inspection. Oil can then be added / removed to set the desired oil level.

I am going to add a fill port on the case at the advised height, just like the Eatons have and run a closed system with supercharger oil, and just keep an eye on temps and any discolouration on the gears. Looks like yours already has the dipstick so problem solved!

Hope that helps anyway.

Tom

Both of are using Laminova air to water chargecoolers yes.

I know nothing about this, but engine oil? To lubricate gears? Isn't that why we have gear oil, or are we just dumb consumers being suckered by the lube manufacturers?

Hi Ironhydroxide - just to let you know on the oiling front I went with an engine fed solution in the end. Further research and more contacts gave me the info that the size 2 supercharger I run does not have enough available volume in the case to run enough oil without the level being too high on the gears and cooking them and the seals. The restrictor required is smaller than a normal turbo restrictor. I am using a 0.6mm restrictor with a -10 drain. I run 60psi oil pressure on the relief valve. It has been working well the last few weeks on road, dyno and track. Hope it helps if you are still going down that route.