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 Post subject: Re: 2018 new cam results
PostPosted: Tue Jul 10, 2018 4:33 pm 
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I would think that would include an increase in MPH, being that the mass is the same but power increased. Suing the rule-of-thumb calculator, 50 HP at the wheels should be around +4 MPH. less 20% for driveline, then +3 MPH. I have to find last year's tickets and compare the DAs to see if there is anything there.

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 Post subject: Re: 2018 new cam results
PostPosted: Tue Jul 10, 2018 4:44 pm 
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I speak in terms of flywheel horsepower. Fifty horses at the tires is a ton and you won't see anything like that. A tenth in the 1/8 or 1/4 is usually around 20-25 hp at the engine.

You also have to remember that the trap speed will not always match the ET. The trap speed is really an indicator of the potential of the engine. Brian Gilchrist's Mustang with my 434 traps at almost 141 mph, but is currently only running 9.60's. It's very soft out of the hole because of his 1st gear ratio and he's losing a bunch of ET there.

It's possible that your trap speed will stay at 101-102, but your ET will increase when you wring the engine out a little more.

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 Post subject: Re: 2018 new cam results
PostPosted: Tue Jul 10, 2018 6:59 pm 
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April 2017 - no DA recorded
1.29-5.68@120.84
1.29-5.67@121.02
1.29-5.67@120.87

5/5/2017 - no DA
1.31-5.58@124.04 <-weird, not repeated, ever

8/5/2017 - DA 5391
1.45-5.89@120.03
1.46-5.91@119.94

07/07/2018 - DA 4573
1.27-5.62@120.94
1.25-5.58@121.98
1.28-5.64@121.65
1.28-5.65@121.26

So over all there is improvement. I may have had expectations that are unrealistic. Your clarifications help ground my expectations - thanks! What hasn't been tried yet is launch RPM tests. Will get to that later. The real Main Issue right now it to find one good RPM to leave on and work on the button. I only have about 3 or 4 TnTs left in the year, then 1st grandson start senior year of high school football and racing/car takes immediate back seat. :D

Found some thicker Cometic gasket material at O'Reillys today, will cut some new china wall gaskets from that and maybe tap the tiny holes in the china walls to 1/4-20 for some button head machine screws to pin down the plate. And a fresh o-ring+ maybe axle grease on the dizzy seal. And make a 2600 chip from some resistors found at the electronics store.

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Last edited by Falcon67 on Tue Jul 10, 2018 7:07 pm, edited 1 time in total.

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 Post subject: Re: 2018 new cam results
PostPosted: Tue Jul 10, 2018 7:05 pm 
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The way I read it is that you have gained almost 2mph and it shows that there's more in the combo waiting to be squeezed out. It looks like it's coming on harder towards the end.

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 Post subject: Re: 2018 new cam results
PostPosted: Tue Jul 10, 2018 7:10 pm 
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Don't forget to silicone your bolts....

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 Post subject: Re: 2018 new cam results
PostPosted: Wed Jul 11, 2018 8:44 am 
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Location: Texas
Brent, You said this in a post to Falcon
"I would consider a .2 ET change and a 1 mph trap speed change pretty significant in an 1/8th mile, especially while shifting way short"

Im not looking to argue but looking at his ETs he posted im not seeing where he picked up .200 and a full mph. If you take the averaged of his first 3 runs that equals 5.6733333 and 120.91mph average
now his new cam advantages are 5.6225 and 121.45mph So that’s really only a .050 ET difference and a .54mph difference.

In comparison with my car last year to this year where i only just changed the back tires. the 4 run average with the old tires was a 7.45 and 93.85mph. Now with the new tires the average from the 2 runs I got is 7.25 and 94.98mph
now that is a solid .200 quicker and 1.13mph increase.


Last edited by nova467spanker on Thu Jul 12, 2018 8:15 am, edited 1 time in total.

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 Post subject: Re: 2018 new cam results
PostPosted: Wed Jul 11, 2018 8:52 am 
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Yep, I didn't have my calculator out. Was just going off of his comments. I didn't average either.

Any bump is a good bump though and I'm hoping to see a much bigger bump when he lets it spin a little more rpm, gets starting rpm lined out and maybe the converter tweaked. You can't add 8-10 degrees duration to a camshaft and expect to shift it at the same point as the older cam.

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 Post subject: Re: 2018 new cam results
PostPosted: Wed Jul 11, 2018 11:08 am 
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Agree - but I thought I would at least see some change in MPH going from 6400 to 6800. Will take some time to sort things out. I really don't want to spend a "lot" of time sorting the gas setup, we need to get up on alcohol. VP 110 is 9.50/gallon, 2 runs to the gallon more or less. Methanol is $180 a DRUM - 52 gallons! Budget says we need to be running on the booze. :lol:

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 Post subject: Re: 2018 new cam results
PostPosted: Wed Jul 11, 2018 2:23 pm 
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Won't you burn more methanol running though. I thought it was on the order of 2x IIRC. So now you're doing a gallon a run. You'll still be saving money, but it won't be as drastic as you're alluding to, especially with the added maintenance of a methanol fuel system.


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 Post subject: Re: 2018 new cam results
PostPosted: Wed Jul 11, 2018 3:04 pm 
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Money is money. I would expect more like 3/4 gallon/run or so. There is not much more maintenance for alcohol than anything else. I already paid upfront for compatible parts. Running every two weeks should not cause any issues. Longer sits - it only takes a few minutes to pump the alcohol out, put the gas carb back on and run a bit of gas through it. Lots of people here run it and nobody seems to have any particular difficulty with it.

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