I would like to know if any w/m users were able to satisfy a need for 112 octane with pump gas & w/m njection.
I find my boosted engine really like to spin faster,the cars are so much responsive when the blower is spinning faster and I prefer not to have to mix race fuel.Higher boost levels I would be using straight c12 uo to 14 lbs of boost.

What type injection system do you have ?

Sorry I am no help other to say I would not roots supercharge a engine on gasoline. This why methanol is used. IMO

None,carbed

This is a street car!
https://www.youtube.com/watch?v=ZP8UL7n6_ho

So what run it on methanol!

Like E85,it burns like 30% or more rate then gasoline.I would have to have carry 4 cans in the trunk!!

No not E85, that is ethanol. I said methanol and yes you will burn much more of it. It helps lube your blower, helps cool the engine and has plenty of octane for your engine.

Meth/water injection is not a reliable way to run a blown engine. Sooner or later it will cost you a few pistons and probably more damage than that.

How many miles you gonna drive your blown engine on the street? I feel that a 20 gal fuel cell would give you decent range.

I know you are a carburetor user, but if you really want performance and reliability injection is the only way to go.

Blown on gas is really tough on your motor and makes tons of heat with not enough cooling and lubrication for your blower IMO.

And you have to run top of the line race gas if you want your motor to live a long productive life.

I put over 1000 miles a year on the car.Underdriven and 4 lbs on the street.On pump gas @6500 RPM THE BOOST IS 5.5....Anything more than c12 is used.I have not seen more than 200* inside the intake manifold and that was after driving back from a cruise spot 15 miles away and going to my test/record road.The blower HAD to be heat soaked and it was 85* that night.
The carbs are kinda blubbery @ 4 lbs and wake right up with a few more lbs so my thought was if W/M does as they claim I would be able to run 6 or 7 lbs with pump gas on the street without worry.I have melted a few pistons!

What about using a boost retard setup for you ignition?

The last blown pump gas street hemi motor I built and dyno tune work the best with 33 degrees at 7300 RPM with 7.0 lbs. boost on CA pump swill back in 2002 or so making 924 HP at 7300 RPM
That was at 12.0 under driven, we swapped the pulleys which ended up making the blower 13% overdriven and switch the fuel to 112 octane race gas and retarded the timing to 25 degree total, the motor pick up a little over 100 HP(1027 HP) at 6500 RPM with 12.0 lbs. of boost but it started into detonation We should have made the timing around 20 degrees total to start with more boost
That was using Champion RN9YC plugs also A RN6YC may have been a better choice with the increased boost

BUTTT .. You suggest INJECTION on your first post !

That's not the type of injection he's talking about. What Al is referring to is a supplemental system of spraying water or methanol into the engine to reduce the supercharger and intake charge temperature.
Like this: https://www.summitracing.com/parts/avm-30-3350/overview/

Al, I had a system on my old Duster. It was made by a company called Devil's Own. It dropped my 1/4 ET by almost 2 tenths, IIRC.

Al........a 9 second car shouldn't be melting pistons. How much timing were you running when those pistons were in the motor?

I hurt a piston like yours when I was running a 572 BBC injected on methanol, no blower. The ring land was too close to the top and I ran it too lean and too much timing.

This piston was in a 451" screw blown brad anderson hemi motor. It was early on in my TAD days and was caused by the fuel shutoff going closed from Gs in the middle of the run. After this we always taped the fuel shutoff open with a small piece of tape to keep it open and I could still reach up pull it closed at the end of the run.

It torched the sleeve, the block deck, the head, the trans blanket, the racepak wiring, the parachute, the rear part of the paint job and much more.

I took the head off on the way home from the track in the trailer while my crew drove the truck on a Sunday night. I sent the head to BAE next day air on Monday morning and they repaired it on Tuesday and sent it back to me on a Weds. I took the block to Indy Cly head and had the block welded and resurfaced while I waited. I removed the sleeves and installed used ones that I had. I only had one motor then and put the motor back together and in the dragster on a Weds night and then drove to a track on Thurs and was ready to race on that Friday. I qualified to race that weekend. That in it's self was a victory.

Actually I built the motor and my crew put it back into the dragster on that WEDs night while I did other things to the car. I had 3 guys helping me then.

I have done all kinds of crazy sh!t like that over the years. When you race top alcohol you are able to get stuff repaired quickly just as long as you have the money.I had several good sponsors that I represented and had to be at the track for them. I got extra TV time because of it. My sponsors liked that.


It even torched the wist pin.

I personally don't think he melted pistons, those pistons were damaged by pre ignition. In other words not good enough gas was used. I bet the rod bearing was beat up on that cylinder. IMO

Snow Performance sells many kits. I used a kit on my old 440-6 Charger. It worked every well and had a noticeable power difference. I could run 93 and full timing. I'd check with them and see what kit would best fit your application. meth/h2o

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I personally don't think he melted pistons, those pistons were damaged by pre ignition. In other words not good enough gas was used. I bet the rod bearing was beat up on that cylinder. IMO [/quote]

Pushed my luck on pump gas,,,,not enough octane

Yo Al... Ever hear of a Spearco system ?

There has been lots of the drag week guys that run meth to supplement pump gas or even E85. The ones I have seen are usually fuel injected turbo cars and they run one or more nozzles in the intake stream and it is controlled by the EFI. One example I can think of and I could be wrong is Frank Sapanaro's Chevy II wagon. Twin turbo no intercooler E85 with meth injection and was in the high 7s. I know he changed his setup since then and might race on methanol entirely, I know he has 24 fuel injectors crammed onto it.