The newest drag racer gears up!

[YENKO DEUCE REGISTRY]

Game on [img]<<GRAEMLIN_URL>>/naughty.gif[/img]

The valve spring compressor tool was more $$ than the set of valve springs / retainers / and locks! That is rare for these little high strung engines!

[Xplantdad]

Looks great!

[YENKO DEUCE REGISTRY]

Planning to head out to Numidia Dragway this Saturday for a TnT, get some seat time and collect some data. We'll be ready for that Flying Dutchman old timer! [img]<<GRAEMLIN_URL>>/naughty.gif[/img]

[img]<<GRAEMLIN_URL>>/grin.gif[/img]

[Xplantdad]

I don't know....Benny is gonna be good! [img]<<GRAEMLIN_URL>>/beers.gif[/img]

[YENKO DEUCE REGISTRY]

The Young Ben is 10 years old, and had a string of 16 consecutive lights under .050! Hard to beat the reflexes of the youngsters, [img]<<GRAEMLIN_URL>>/grin.gif[/img]. I think he'll put a hurtin on the Old Ben! [img]<<GRAEMLIN_URL>>/naughty.gif[/img]

[Xplantdad]

Could be Marlin...could be...but never count out experience [img]<<GRAEMLIN_URL>>/smile.gif[/img] [img]<<GRAEMLIN_URL>>/beers.gif[/img]

[YENKO DEUCE REGISTRY]

So, while 'Older Ben' was partying this weekend, [img]<<GRAEMLIN_URL>>/grin.gif[/img] 'Young Ben' was testing at Numidia Dragway which is up around Bloomsburg, PA. [img]<<GRAEMLIN_URL>>/naughty.gif[/img]

We had decent weather; a little chilly in the morning at 48 degrees, but a very strong cross/head wind at 15-20+ mph. Good thing for TnT days because we basically fought the car all day until the 7th run, but ran out of time to make the 1 change that I really wanted to - a rear gear change from 5.25:1 to 6.00:1.



First run outta the box was a 9.16 - too slow, even for the cold temps. Second run was slower at 9.3x. Sputtering and bogging off the line, breaking up at the big end, low mph..... just miserable. Downloaded the runs onto the laptop, and they looked horrible - all kinds of stuff going on. So we started making changes, and running, and changes, and running, etc. Our friends Joel &amp; Joel were running waaaaaaay too fast in their new car/engine combo - reminded us of how we started out in 12.90's!



The last run of the day the air temp was coming around at ~60 degrees, and we were finally improving each run - and ended up with the original setup back into the car. We ran an 8.914 on an .037 light. We took a nice picture, called it a day, and began the 2+ hour pull home. Ben did his job all day, drove it straight and true - the cross wind would whack the cars at about half track, just as they went past the grandstands. The cars were wiggling all over the place! Ben went red once with an .011, but all other lights were no slower than an .053 - he had two .002 lights in a row! Watch out Ole Ben, [img]<<GRAEMLIN_URL>>/grin.gif[/img]



Ben is proud of his burnouts, and took a pic of the after effect flung all over the back of the car!

[YENKO DEUCE REGISTRY]

Just like other drag cars, these Jr's will make you pull your hair out! [img]<<GRAEMLIN_URL>>/eek.gif[/img] Went to Maple Grove this past Sunday for TnT, and just couldn't seem to get the ET's we expected. Changed the rear gear to a 6.00:1, and did get better ET's and 60' times (1.89's!!) but this car should be flying. We now have a vibration issue to figure out along with the other headaches!

As Rob says, if it was easy - everyone would be doing it!

Still a fun day - no matter what happens. [img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img]

[jeff morocco]

Hey Marlin,
what are your head temps leaving the line and at the end ? Those 8.90 motors LOVE the heat in the head. I like to make sure we are at about 150 degrees on the line. right around 350 or so at the other end.exhaust temps are 550 and 1300 at the end.33mm i run a 57 pilot , 185 main , .7,.8 air bleeds and mixture screw is 3/4 of the way out. Both cars are identical to make it easy on me except on Coles car i have 50 lbs of weight on it. i sometimes take weight off to stay in the 8.90 range but with two cars, i usually dont have time to mess around. what it runs on race day, it runs.
On your graph, does your rpm get up to 8000 and stay there or does it gradually lose rpm ? my 8.90 combo in the clutch is 15-28-22 ramps, 6 grams on each arm , 38degree helix and the yellow spring on the secondary in the 5th hole. If your losing rpm down track, try removing some weight off the arms. like 1 gram at a time until the rpms stay up in the 8000 range. I run a 12 tooth front and 72 tooth rear for a 6.00 to 1 gear ratio.
hope this helps you.

[YENKO DEUCE REGISTRY]

Thanks Jeff - always good to compare setups. Ours is pretty close to yours:

Our setup:
• BZ1, 3x3 (I was told! Crank does say 3”) Dyno 125 cam
• 33mm, .8 &amp; .7, 57 pilot with 195 main, mixture screw ¾ turns out
• Polar Jr primary clutch with 15-28-22 ramps, purple spring, 12 grams on the arms
• Gaged secondary, 38 helix, blue spring, 4th hole
• 14/84 sprockets =’s 6.00 gear
• 18x8x8 tires
• Last run:
o RT = .014
60' = 1.929
330' = 5.502
660' = 8.763
MPH = 73.73

CHT - start = 153
EGT - start = 624

CHT - end = 239
EGT - end = 957

After conferring with others, and a few conversations with Huddleston, I've made some changes:

- took 2 grams off the arms, so I've now got 10 grams on them
- put the red spring into the Gaged secondary, probably the same effect as the Gaged specific 'blue' spring but its more common and an easier reference point
- put the 38 (roller) helix into the 5th hole to slow the engagement down a bit
- resetting the timing, was probably 150 thou in the hole, and will go to 350-400 thou
- installing a new NGK B6HS plug, had an NGK from the Yenko in there - probably not much impact, but...
- moved the rear sprocket / hub so that the chain is dead center between the frame rails. prior owner had the hub on backwards
- installed new rear axle bearings
- installed new brake rotor and pads, corrected the caliper install as it was literally floating - prior owner had it installed wrong
- changed main jet from a 195 to a 185 to get the EGT temps up at the big end
- changed fuel bowl to a Huddleston unit with the quick change jet option, which means that I removed the acc pump rod

There's probably more, but I'm tired of working on it - and need to run it to find out where we are. Season starts this Saturday, but we will miss Day 1 because of a baseball game. Might get a TnT in on Friday night.