7.0 and nitro

[wideopen231]

Read spuds noted. Heck I could rewqrite the notes by memory.LOL

[AF150]

Wideopen 231...

You will love it if you ever get out there. Index racing is perfect for injected nitro. We changed our Jr/fuel combo over to run NE1 back in the late '90s. went from 15:1 to 10.5:1 with flat top pistons, re-calibrated the fuel system with 7 gal pump & 30A nozzles, changed to aluminum rods and put a 3.70 gear in the car.

Back then the index was 7.50 and we found we could dial into the index by changing the percentage a little depending on conditions. In the good air at Bakersfield, 30 to 35% usually did the job. This is with a pretty light 1450# car with driver and 406 cu. in. sb Chevy. It left hard and would run 185 or so on the big end.
Good simple combination. We won the March Meet in 1999 and a bunch more stuff in the next few years.

I would recommend this type of combo as it is low maintenance with good results. Don't over think it and
take good care of your fuel system between races.   Just my 2 cents.

Mike

[wideopen231]

AF150

 Question on why lower compression with the nitro? We run 15:1 in the A/Fuel car I work with. Yes it is Hemi and stronger bottomend and bigger combustion chamber. We also run 40 gpm and dual 44 amp mags. While I don't have 44 amp mags or a 40 gpm pump I also do not plan to run 95%, I do have 2 msd mag 12's and two 20 gpm pumps and already have 3.90 gear with 1.68 low and?or hi/low trans valvebody and could leave in low  to lad engine, the converter would be 600* probably(lol). More of joking with slight chANCE ON THAT LAST COMBO OF PARTS.

 was lower compression for less abuse to bottom end,bigger tunning window or just with sbc they are not crazy about bunch of compression and bigger loads? Just wondering.

 ANy idea on combo of Nostalgia A/Fuel cars.Gears compression and know need clutch and can. Bad part I sold both in past and that is why I hate to sell stuff.

[wideopen231]

Finally found a topic to get some activity on site. Nothing like nitro to get things going fast.LMAO

[AF150]

Running A/F is a big step from 7.0 pro. More than a second if you want to outrun Bates and those guys.
Just make enough power to win rounds and not break stuff. If you are good at the tree, that approach will win some index races for you.

If you want to run a heads-up class and set records...well you better get your wallet out because we are talking apples and watermelons here.

I think we used our budget wisely, had some success, and had a xxxx of a lot of fun.
Good luck whatever you decide to do.

Mike

[wideopen231]

Oh I know the cost of headsup.Ran TA/FC for 4 years chasing points and cheapest was 125k and that was 1992 and 94 missed the championship by less tahn two rounds and came down to final race. The A/fuel car i work on is running 2500 to 3000 per pass right now.

Would like to play in nostalgia A/fuel. As with all spped cost is only optical . LOL 7.0 is a lot closer to can almost afford. Only real cost would be meeting rules for cert.s. everything else is sitting here.

[JEFF/21C]

AF150 I would like to hear more about your 406 we ran a 406 on alky ended cracking the stock block in the rear cam journal oil passage

[AF150]

Jeff...
We used a well seasoned 400 block out of a taxi. Nothing special, .030 over, 4 bolt caps, Oliver rods on a light weight Crower crank, 15:1 JE pistons with nice iron heads that flowed 300 cfm. 2 & 5/16 Hilborn injectors with a 5 gpm pump on alcohol. Nice combination ... ran low 7.70s at 175mph in a FED that weighed 1450 on the line. Actually won Jr./fuel at the first CHRR 30 years ago. Switched to 30-40% nitro
in '98 and won NE-1 at the '99 March Meet. Ran this combo another 5 years and sold the car to guys in California. They ran it injected for a while, finally put a blower on it and managed to break it. Must have been a real good casting is all I can tell you.

Mike

[JEFF/21C]

Thank you for the reply, I'm always curious about different set-ups

[wideopen231]

If I was running 400 mblock with alky I would fill the block and forget about it. With alky there is no need for water in block and if wanted to run water thru heads short iff it just enough to allow ater flow. I have never run WATER IN ALKY MOTOR.  JMO

[JEFF/21C]

That's what we did, block filled, water in heads and splayed  main caps

[AF150]

That is what we did also.

[slingshot383]

I know in my injected 408 Chrysler Wedge, 10% gave me a .10 in the 1/4 mi. and 18% gave me 2 .10's, 10% was no change to anything, timing, fuel jetting or converter. That 18% wanted a tad more fuel and it was pushing the converter pretty hard. 14.2:1 compression Ross pistons, GRP rods, steel 383 crank, indexed and cut down for SBC big end, Indy 440-1C heads, Indy stack injection that had been heavily modified (from Indy, it would either idle or run flat out, wouldn't do both) MSD 7AL-3 box with the MSD 2 amp coil.