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Search took 0.01 seconds. Search: Posts Made By: JohnTN
Forum: Pontiac - Street 06-06-2019, 10:22 PM
Replies: 1
Views: 767
Posted By JohnTN
If the current one clears all moving parts you...

If the current one clears all moving parts you should not need a new one. I think the possible restriction is when the choke opens up the accuating arm of the choke moves toward the outer edge of...
Forum: Pontiac - Street 02-07-2018, 01:09 AM
Replies: 5
Views: 316
Posted By JohnTN
Do you mean a Street Demon 1904 which is a 750...

Do you mean a Street Demon 1904 which is a 750 cfm carb by Holley? Different carb than a Speed Demon.
Forum: Pontiac - Street 11-03-2015, 03:25 PM
Replies: 48
Views: 2,302
Posted By JohnTN
Success in Tuning Street Demon 625 Carb for Mileage

As I last posted on Sept. 8, I have gone to leaner primary rods and jets on a Street Demon 625 to try and improve gas mileage. My car has a mild Olds 350, 8.5:1 compression, 2004R transmission,...
Forum: Pontiac - Street 09-09-2015, 09:36 AM
Replies: 48
Views: 2,302
Posted By JohnTN
Tony (fiesta), I understand about giving up...

Tony (fiesta),

I understand about giving up the chase unless your car is driven frequently. It can be expensive and time consuming; but metering rods are fairly inexpensive and quick to change -...
Forum: Pontiac - Street 09-08-2015, 10:46 PM
Replies: 48
Views: 2,302
Posted By JohnTN
Hey fiesta, You say you tried different sets...

Hey fiesta,

You say you tried different sets of primary rods to try and get better fuel mileage on your SD 750. When you went from the stock 56/40 rods to the 56/48 rods you didn't lean out the...
Forum: Pontiac - Street 08-18-2015, 11:10 PM
Replies: 38
Views: 995
Posted By JohnTN
Jon, no I don't want to do that either. ...

Jon, no I don't want to do that either.

Wouldn't there be fuel up to the inlet valve to the carb? Would just 5 seconds of cranking put enough fuel in the bowl to get the engine started by a pump...
Forum: Pontiac - Street 08-18-2015, 02:04 PM
Replies: 38
Views: 995
Posted By JohnTN
If the problem is an empty fuel bowl, couldn't...

If the problem is an empty fuel bowl, couldn't the carb be primed by just letting the engine crank for 15-20 seconds to fill the bowl, then press the pedal once to set the choke and provide initial...
Forum: Pontiac - Street 04-08-2015, 11:17 AM
Replies: 20
Views: 673
Posted By JohnTN
A vacuum switch that disengages the OD when...

A vacuum switch that disengages the OD when manifold vacuum drops due to opening throttle helps driveablility. When in OD, if you give car heavy increase in throttle the vacuum drops, the vacuum...
Forum: Pontiac - Street 03-13-2015, 09:29 AM
Replies: 19
Views: 350
Posted By JohnTN
Bought direct from Demon.

Bought direct from Demon.
Forum: Pontiac - Street 03-13-2015, 09:01 AM
Replies: 19
Views: 350
Posted By JohnTN
Overkill, No haven't tried that, not sure...

Overkill,

No haven't tried that, not sure how to do that. Will look. Leaving on vacation at noon so won't get to work on it for next 10 days.

But will be watching this board for anymore...
Forum: Pontiac - Street 03-12-2015, 11:07 PM
Replies: 19
Views: 350
Posted By JohnTN
I read through the link shaker455 posted before...

I read through the link shaker455 posted before buying the carb. The link was informative and for the most part positive.

But for those of you who have the Street Demon, have you experienced the...
Forum: Pontiac - Street 03-12-2015, 01:05 AM
Replies: 48
Views: 2,302
Posted By JohnTN
fiesta62, Any improvement in fuel mileage...

fiesta62,

Any improvement in fuel mileage with the leaner rods?

John
Forum: Pontiac - Street 03-12-2015, 12:49 AM
Replies: 19
Views: 350
Posted By JohnTN
Experience with Street Demon Carb

I recently installed a 625 cfm Street Demon on my mild 350 Olds to replace a QJ. The QJ had a smooth transition into the secondaries. I find the Street Demon takes some extra pedal pressure to move...
Forum: Pontiac - Street 11-26-2014, 12:33 PM
Replies: 17
Views: 698
Posted By JohnTN
As for carburetor, there seems to be some...

As for carburetor, there seems to be some interest in the Street Demon series introduced in 2012 (comes in 625 cfm and 750 cfm, starting at $279). This is spreadbore carb with smaller primaries. Do...
Forum: Pontiac - Street 11-19-2009, 09:36 AM
Replies: 117
Views: 4,519
Posted By JohnTN
Torque is physics. HP is just math.

Torque is physics. HP is just math.
Forum: Heating & Cooling TECH 11-11-2009, 09:47 AM
Replies: 21
Views: 958
Posted By JohnTN
I tried a Mr. Gasket hi-flow and my engine would...

I tried a Mr. Gasket hi-flow and my engine would not warm up to the 180* spec. Went to a Stant and it warms up fast and sits right on 180*.
Forum: 67-69 Firebird TECH 11-10-2009, 12:24 PM
Replies: 10
Views: 267
Posted By JohnTN
My brother has a 1967 FB 400 convert originally...

My brother has a 1967 FB 400 convert originally owned by me. It is unmolested and spare has never been used. If you don't get what you need, I can get a picture in a few days.

John
Forum: Pontiac - Street 11-07-2009, 09:24 AM
Replies: 80
Views: 1,883
Posted By JohnTN
We street rodded a 1939 Olds in solid condition...

We street rodded a 1939 Olds in solid condition -- frame-off restoration took about 1200 hours, most of it hired out labor to a shop.
Forum: Pontiac - Street 11-02-2009, 11:07 PM
Replies: 257
Views: 15,418
Posted By JohnTN
I'm dying to know how the cam degrees. I chased...

I'm dying to know how the cam degrees. I chased the same symptoms on a mild Olds 350 for a year before finally degreeing the cam. Turned out the mechanic had installed it 45 degrees advanced (3...
Forum: Pontiac - Street 10-30-2009, 11:46 AM
Replies: 6
Views: 275
Posted By JohnTN
Does it make any difference whether ported or...

Does it make any difference whether ported or manifold source is used?

I know that ported will deactivate lockup when throttle drops to idle position which allows for freer coast down; and,...
Forum: Pontiac - Street 07-10-2009, 10:41 AM
Replies: 12
Views: 754
Posted By JohnTN
Well, I discovered why my ported vacuum through...

Well, I discovered why my ported vacuum through the delay valve isn't allowing the lockup to engage. My vacuum switch doesn't hold vacuum. It bleeds off vacuum about as fast as the delay valve lets...
Forum: Pontiac - Street 07-09-2009, 07:24 PM
Replies: 12
Views: 754
Posted By JohnTN
Did you put the DIST side toward the vacuum...

Did you put the DIST side toward the vacuum source, which is the way I think it should go?

If instead you put the VAC side toward the manifold vacuum, the vacuum will pull through the valve very...
Forum: Pontiac - Street 07-09-2009, 02:38 PM
Replies: 12
Views: 754
Posted By JohnTN
I also ordered a DSV35 from an EBay store and...

I also ordered a DSV35 from an EBay store and received it today. It seems to work as I expected by sucking on the ends - one sucks easily, the other sucks very slowly.

First I connected it to a...
Forum: Pontiac - Street 07-04-2009, 04:18 PM
Replies: 15
Views: 1,398
Posted By JohnTN
Back to the question of orienting the delay...

Back to the question of orienting the delay valve. Once you have the right valve, it seems to me you want the end that can be sucked on easily to be toward the vacuum switch, and the end that is...
Forum: Pontiac - Street 07-04-2009, 04:06 PM
Replies: 15
Views: 1,398
Posted By JohnTN
I have been running a 2004R with lockup thru a...

I have been running a 2004R with lockup thru a toggle/brake/vacuum switch circuit for a couple of years. Works fine except when vehicle speed drops below about 40 mph and engine tends to lug unless...
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