CK5
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All things Drag Racing.
- Thread starter 500$k5
- Start date
The race car is coming along good. Heath is sorting out the mandrel/pulley alignment and wrapping up the fuel injection.
Hopefully it will make it's debut at Edgewater for an AMC/Mopar meet in June.
The street strip car isn't coming along as good. For sentimental reasons, I decided to keep the old block since it has billet caps, roller cam bearings and bushed lifter bores. Down side is it was bored to 4.250 and filled with Rokblock (4.195" is considered a safe max for a 401) so it now has 8 sleeves which reduced the ci from 454 to 440. The plan is to do try and get into some of the Sick events, so the cr was dropped down to 13/1 and a smaller cam was installed but we went from Indy SR heads to Indy race heads and now the extra head bolts don't align up and interfere with the sealing ring on the head gaskets, so we're welding up the original holes for the extra head bolts and drilling/sleeving new ones and Cometic is making some custom head gaskets.
Only other item of concern is the shaft rockers. Ordered replacements from Jesel and the new ones are cupped and will require differnt puchrods. Not a big deal but they both have the same part number so you would of thought that they'd be the same.
Hopefully all this is figured out and we hope to pick the engine up on the way back from Ohio in June. Plan is to have the car together and run it a Cordova in September.
We chased fueling issues all day.
The alcohol conversion is a learning curve. Went from 200 to 180 to 220 jets…needs more timing we think.
Try again tomorrow.
The alcohol conversion is a learning curve. Went from 200 to 180 to 220 jets…needs more timing we think.
Try again tomorrow.
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Racing update: Car was erratic. Pull hard, fall on it's face, then pick up and run good. Fuel pressure was good. Turns out the carb doesn't have rear jet extensions, and float levels were too low. It's hard, when the owner likes to change too many things at once. lol
Don't get greedy. One change per pass.
I thought it was change 62 things, to get 1 good pass out of 6. LOL
I have seen people do close to that so many times. It is hilarious when a car is launching sideways and they adjust multiple things, and it gets worse.
We chased jetting, timing, and plug reading. So many opinions on that subject itself!
Car has lost a full second over the gas carb setup.
We got headed in the right direction but lost second round, so done for the weekend. Had pizza, chicken wings and rum/coke to check out for the weekend.
Car has lost a full second over the gas carb setup.
We got headed in the right direction but lost second round, so done for the weekend. Had pizza, chicken wings and rum/coke to check out for the weekend.
Changing fuel is a huge step. Never correct the first time out. Takes a while to get tuned in. Just means more passes. So the fun goes on.
Frustrating, but at least you made the best of it to have fun still!
Are you sure you are correcting the true cause? How did it sound through the pass? Anything else change other than the carb?
At least you didn't have to cleanup spilled gas every time you drained the bowls, methanol is gone before you can get a rag to wipe it up, ha ha. I just don't feel its worth the hassle for a NA engine.
Are you sure you are correcting the true cause? How did it sound through the pass? Anything else change other than the carb?
At least you didn't have to cleanup spilled gas every time you drained the bowls, methanol is gone before you can get a rag to wipe it up, ha ha. I just don't feel its worth the hassle for a NA engine.
How was the fuel pressure going down the track?
Are the needles and seats capable of flowing sufficient fuel volume?
Are the needles and seats capable of flowing sufficient fuel volume?
That sounds to me like its more than just an incorrect A/F ratio, it would have to be so far off it would barely run it sounds like. I was thinking that when you said a full second, you can sweep a pretty large A/F ratio window and not change even half of that on an NA engine.
Carb is a methanol converted unit setup by a “carb pro”…. At this point its pretty skeptical.
the whole fuel system is under scrutiny at this point. Fuel pressure gauge took a crap, so that was an unknown.
we couldn’t experiment too much as elimination rounds came around, trying to be a little consistent, but dialing a time was a bit of a crap shoot at that point.
the whole fuel system is under scrutiny at this point. Fuel pressure gauge took a crap, so that was an unknown.
we couldn’t experiment too much as elimination rounds came around, trying to be a little consistent, but dialing a time was a bit of a crap shoot at that point.
We picked up .7 and 8 mph, on the change from 180 to 220 jets. Even at that point still more than a second slower than previous gas passes.
