What plug gap on my 15:1 , 600ci N/a and nitrous?

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What plug gap on my 15:1 , 600ci N/a and nitrous?

Post  rocketpony on August 23rd 2016, 1:36 pm

I'm gona run ngk 10 on motor and 11 on nitrous (200-300hp shot).
So what should I gap my 10's at while on motor? And what should I gap my 11's at on nitrous?

Motor is 600ci, 15:1
C460 heads and intake
Single 1475 carb
Q16 fuel
Cam 289/308 .873/.840 and 114lsa

Used in a 1/4 mile car, no street use

Thanks

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Re: What plug gap on my 15:1 , 600ci N/a and nitrous?

Post  richter69 on August 23rd 2016, 2:26 pm

I run um out of the box, verify there is some daylight between the electrode and strap, proper heat range ... And in they go.....
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Re: What plug gap on my 15:1 , 600ci N/a and nitrous?

Post  Frank Merkl on August 23rd 2016, 2:44 pm

.025" N/A
.022" Nitrous
Frank
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Re: What plug gap on my 15:1 , 600ci N/a and nitrous?

Post  rocketpony on August 23rd 2016, 4:05 pm

Thanks guys!!

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Re: What plug gap on my 15:1 , 600ci N/a and nitrous?

Post  richter69 on August 23rd 2016, 4:22 pm

They are gonna be real close to .022 out of the box fwiw
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Re: What plug gap on my 15:1 , 600ci N/a and nitrous?

Post  richter69 on August 23rd 2016, 4:23 pm

Careful w that combo on nitrous.
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Re: What plug gap on my 15:1 , 600ci N/a and nitrous?

Post  rocketpony on August 23rd 2016, 7:08 pm

richter69 wrote:Careful w that combo on nitrous.

Why is that?

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Re: What plug gap on my 15:1 , 600ci N/a and nitrous?

Post  rmcomprandy on August 23rd 2016, 8:44 pm

There is no "magic bullet" here.
The ignition system's other components will have a giant affect upon what the maximum spark plug gap can be.

Use the gap which goes the fastest for that particular situation.

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Re: What plug gap on my 15:1 , 600ci N/a and nitrous?

Post  rocketpony on August 23rd 2016, 11:41 pm

What would b a good starting point with timing? I'm thinking 32

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Re: What plug gap on my 15:1 , 600ci N/a and nitrous?

Post  Hardy on August 23rd 2016, 11:46 pm

im thinking he's saying that because the 15:1 compression and the 114 lsa will make the tuning window very tight on nitrous. Not sure if q16 works the best with nitrous as well. But I don't know shit, so hopefully he'll be back to ckarify

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Re: What plug gap on my 15:1 , 600ci N/a and nitrous?

Post  Hardy on August 23rd 2016, 11:49 pm

rocketpony wrote:What would b a good starting point with timing? I'm thinking 32

Fwiw my dads 601 c head deal is happy at 31.5*. Every engine is different, but I'd say 30-32 is a safe starting point

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Re: What plug gap on my 15:1 , 600ci N/a and nitrous?

Post  Frank Merkl on August 24th 2016, 1:05 am

Hardy wrote:
rocketpony wrote:What would b a good starting point with timing? I'm thinking 32

Fwiw my dads 601 c head deal is happy at 31.5*.  Every engine is different, but I'd say 30-32 is a safe starting point

on motor! on the juice she's a whole new ball game !! 400hp no more than 12* 1000hp - 4* total !
Frank
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Re: What plug gap on my 15:1 , 600ci N/a and nitrous?

Post  Hardy on August 24th 2016, 1:18 am

Frank Merkl wrote:
Hardy wrote:
rocketpony wrote:What would b a good starting point with timing? I'm thinking 32

Fwiw my dads 601 c head deal is happy at 31.5*.  Every engine is different, but I'd say 30-32 is a safe starting point

on motor!  on the juice she's a whole new ball game !! 400hp no more than 12* 1000hp - 4* total !
Frank

Oh god ya lol. I just figured when he said starting point he was talking motor only

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Re: What plug gap on my 15:1 , 600ci N/a and nitrous?

Post  rocketpony on August 24th 2016, 5:34 am

Hardy wrote:
Frank Merkl wrote:
Hardy wrote:
rocketpony wrote:What would b a good starting point with timing? I'm thinking 32

Fwiw my dads 601 c head deal is happy at 31.5*.  Every engine is different, but I'd say 30-32 is a safe starting point

on motor!  on the juice she's a whole new ball game !! 400hp no more than 12* 1000hp - 4* total !
Frank

Oh god ya lol.  I just figured when he said starting point he was talking motor only

That's correct, I was referring to on motor

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Re: What plug gap on my 15:1 , 600ci N/a and nitrous?

Post  tbirdmike on August 24th 2016, 1:15 pm

Hardy wrote:im thinking he's saying that because the 15:1 compression and the 114 lsa will make the tuning window very tight on nitrous.  Not sure if q16 works the best with nitrous as well.  But I don't know shit, so hopefully he'll be back to ckarify

No direct experience from me.
From the Nitrous forums I follow (and several of the top Nitrous tuners and kit builders) q16 will make NOS tuning very difficult. And if that head has a tight quench it will add to the problem.

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Re: What plug gap on my 15:1 , 600ci N/a and nitrous?

Post  rocketpony on August 24th 2016, 2:06 pm

tbirdmike wrote:
Hardy wrote:im thinking he's saying that because the 15:1 compression and the 114 lsa will make the tuning window very tight on nitrous.  Not sure if q16 works the best with nitrous as well.  But I don't know shit, so hopefully he'll be back to ckarify

No direct experience from me.
From the Nitrous forums I follow (and several of the top Nitrous tuners and kit builders) q16 will make NOS tuning very difficult.   And if that head has a tight quench it will add to the problem.

Well that's unfortunate. Guess better use small shots of nitrous for now

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Re: What plug gap on my 15:1 , 600ci N/a and nitrous?

Post  richter69 on August 24th 2016, 2:50 pm

Its the q16 thats the issue w a combo thats already timing sensitive... Dump some C23 in and your parts will thank you.
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Re: What plug gap on my 15:1 , 600ci N/a and nitrous?

Post  richter69 on August 24th 2016, 2:53 pm

What is the quench?
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Re: What plug gap on my 15:1 , 600ci N/a and nitrous?

Post  whatbumper on August 24th 2016, 4:00 pm

There is nothing wrong with Q when you have a handle on what your motor needs but like said above start with a nitrous fuel first and figure out the combination. Q takes less timing than say C23 or NO2. NO2 is a great fuel as well. We have been spraying over 3000pph on a customers car all year with it on a "timing sensitive" SR20 headed deal.


Frank M above is pretty good at the timing on that head I would say. I've never had a customer spray that head but do have some chevy guys spraying 3000-4000 pph on some pretty tight chambers but with a huge quench. One efi customer for example we launch at -12° ramp that to 4° in first gear and pull it back down to 1-2° in high gear.

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Re: What plug gap on my 15:1 , 600ci N/a and nitrous?

Post  Frank Merkl on August 25th 2016, 1:50 am

get a new cam ! duration is about right , add .050 to the lift . and 117lsa min 119lsa better
Frank
or your going to have this
URL=http://illiweb.com/fa/pbucket.gif][/URL]
1/2 degree  to much for .2 of a second as we had ramp the timing retard slower! I'm learning from the $50k worth of melted aluminum I have and the 24/7 hours it takes to fix it ! but we still put the toes over the edge every Run !!!! DAWM DRAG RACING IS FUN!!!!!
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Re: What plug gap on my 15:1 , 600ci N/a and nitrous?

Post  rocketpony on August 25th 2016, 1:59 am

Wow!
I guess il just use 150-175 hp jetting to start and tune it from there

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Re: What plug gap on my 15:1 , 600ci N/a and nitrous?

Post  Frank Merkl on August 25th 2016, 2:02 am

PS that run was still a 7.17@ 196 MPH on a 7.18 Dial and we lost the piston @ 4.78 seconds into the run ! ,and yes we won the round semi's for a wally !! Still did our 330 ft burnout to the 330 clocks for the final ( no lifters or pushrods in that hole or spark plug and the nozzles with blank jets) The Kid went RED on the launch and we were a brides maid again! 3 years ago!!
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Re: What plug gap on my 15:1 , 600ci N/a and nitrous?

Post  Frank Merkl on August 25th 2016, 2:13 am

I built that car 20 years ago !! myself ! with a 7 year old boy watching !! He drives it now as he spend 8 years in Jr Dragster , No delay box in the car and he can cut constant .004's- .020's , throw an odd red one in , then there will be also a .400 as the other guy red lights !! but HE's a Real Driver !!
Frank
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Re: What plug gap on my 15:1 , 600ci N/a and nitrous?

Post  rocketpony on August 25th 2016, 4:53 pm

Frank Merkl wrote:get a new cam ! duration is about right , add .050 to the lift . and 117lsa min 119lsa better
Frank
or your going to have this
URL=http://illiweb.com/fa/pbucket.gif][/URL]
1/2 degree  to much for .2 of a second as we had ramp the timing retard slower! I'm learning from the $50k worth of melted aluminum I have and the 24/7 hours it takes to fix it ! but we still put the toes over the edge every Run !!!! DAWM DRAG RACING IS FUN!!!!!

How much were u spraying at the time?
I guess if I keep the shot rely small and only activate for short period I should b ok

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Re: What plug gap on my 15:1 , 600ci N/a and nitrous?

Post  Frank Merkl on August 25th 2016, 6:13 pm

3000 pph
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