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Your Builds / Photo Gallery / Re: 145" Slingshot build in the UK
« on: April 25, 2016, 11:27:28 PM »
Thanks for the update Ponti
Whats missing to start assembling it?
Whats missing to start assembling it?
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Awesome thread here, great looking car and tremendous desire by the owner to get it all together and to the track. Love the videos, motor sounds killer. As far as your history goes, here's my addition. Early photos, no way it was a Canadian record holder in the 50's. that style of chassis is probably 67 or 68 build. Definitely Eastern Canada car as pics are at Sanair ( Quebec Cda) and drivers name would appear to be French Canadian. It would have competed in NHRA division 1 in Comp eliminator probably in the C/D class. Real cool car you got there man, keep at it and please more video. Your local track looks very nice and sure has some teeth. Cheers
You are welcome Gass, it is a bit disappointing when I give, asked for advice, and they don't take my advice.
Is your alcohol dragster buddy racing NHRA Top Alcohol racing blown alky or injected nitro ? Blown alky is a different game. i agree with his advice to put one new plug in your motor with any tune-up change, matter-a-fact I suggest a new plug every round. As an example, Q-1 could be early in the morning, at 1200 DA, and Q-2 could be around noon, which could have a density altitude of 3000', well your tune-up just changed because you will have less good air going in your motor, it just got fatter. So I suggest in Q-1 new plug in #1 cylinder , Q-2 new plug # 2, etc, that way it's a little easier to keep track where your new plugs are, plus after 8 runs [ ya I know that might be more than 2 events] you will have a new set of plugs in your motor with only a few runs. At $3.00 each it's not allot of money.
When I 1'st started helping my partner, Bud Hammer he was indexing plugs also, but that goal was to keep the high piston dome [ 16;1] from smashing the plug ground strap closed. When I was doing that I kept trying different plugs until the strap was between 10;00 and 2;00, without using plug washers, I think the washers changes the heat range. But when I built my 1'st RR SBC we cut with a porting tool a "fire slot" in the dome, with the idea it would help the flame front go over the dome, but also not have to index the plugs. I always try to keep our car simple, less likely to have a crew member put the wrong plug in the wrong hole. Also when I ran my motor in a Comp elim [ B/ND] and he had help from the Autolite rep, I asked him now that I cut the fire slot, would it be any advantage to index the plugs 180° from what I was doing, he said Autolite tried that and the dyno test didn't show any difference.
You are right it costs more to go fast , "speed cost money, how fast do you want to go ?" But I know allot of SBC injected alky racers running 8.60's,[NE-2] and 7.60's [NE-1] with bowtie blocks, OEM forged cranks, off the shelf pistons, shifting at no higher than 8500.
Your Vertex is fine until you up your combustion pressure with higher compression and higher fuel flow, and even then you can have Spud hop-up your Vertex, or go to a Mallory Mag. I run 20 amp MSD, because i run around 16;1 compression, 220-230 fuel flow and 10,000 rpm. Your 38° timing looks about right for a non-raised runner heads, but I have helped some JrFuel cars at the Bowling Green Reunion when they had a ton of water grains in the air, you can't burn water, so we kept leaning the fuel and upping the timing to as high as 42° to try to get some heat in the plugs. He would have won, except he red-lighted.
Jon
Another good reason to raise the idle is if you do use the trans brake it will help to make sure its applied fully before you release the hand brake. If you drive up to the line and back use second gear around the pits. It will counteract some of the high idle.