502/ Demon
Thread Starter
Instructor
Joined: Oct 2000
Posts: 126
Likes: 0
From: Leamington ON
502/ Demon Any Experiences
I just bolted on a 850 double pumper Demon to-day to the 502.I can tell you from the first pop :eek: though the the side pipes, this is a totally different car to drive. The engine idle is smoother and quieter,it has more snap:D even before you hit the secondaries. The engine handles the mechical secondary(wow) very nicely. The midrange is totally different. There was nothing wrong with the Holley(850 vac sec)that came with engine from GM the car ran great,idle good didn't load up good power.The Demon atomizes the fuel different from the Holley and with our engine it has a whole new sound to it.
Thanks Cole :flag
[Modified by Colevette, 11:28 PM 9/29/2001]
[Modified by Colevette, 11:31 PM 9/29/2001]
Thanks Cole :flag
[Modified by Colevette, 11:28 PM 9/29/2001]
[Modified by Colevette, 11:31 PM 9/29/2001]
Racer
Joined: Sep 2001
Posts: 371
Likes: 1
From: Nashville TN
Re: 502/ Demon (Colevette)
I had a similar experience with a Speed Demon 650 double-pumper on my '63 with a 327. It replaced a 600 cfm Carter AFB. The performance increase is amazing. I didn't expect it from a carb swap. Throttle response is instant. I also picked up mid/upper range that could be felt by the seat. I am anxious to run the quarter to see what the numbers are. :cheers:
Thread Starter
Instructor
Joined: Oct 2000
Posts: 126
Likes: 0
From: Leamington ON
Re: 502/ Demon (stngry63)
Stngry Good to know you had a similair experience and that its not a fluke with just our engine. I would like to hear from others that switch to a Demon
Cole :flag
Cole :flag
Drifting
Joined: Oct 2000
Posts: 1,642
Likes: 0
From: Boerne Texas
Re: 502/ Demon Any Experiences (Colevette)
Interesting. Can you provide some info on the Demon, such as internet address, or where they can be contacted? Do they put out a catalog??
Thanks in advance! :D
********
Jeff
'66. L72
Keep on :seeya :seeya :flag
Thanks in advance! :D
********
Jeff
'66. L72
Keep on :seeya :seeya :flag
Le Mans Master
Joined: Dec 2000
Posts: 7,245
Likes: 4
Thread Starter
Instructor
Joined: Oct 2000
Posts: 126
Likes: 0
From: Leamington ON
Re: 502/ Demon (67ratrag)
Ratag we haven't opened it up yet, GM says it is 5,800 we have about 1500 miles on it since Aug 15th and limited it to 5000 red line with the MSD,ours is crate stock. My son and I drove it for about 4 hours to-day it really is like a different car.
Cole :D :flag
Cole :D :flag
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Safety Car
Joined: Feb 2000
Posts: 4,977
Likes: 38
From: Massachusetts , USA,
Re: 502/ Demon Any Experiences (Colevette)
Colevette ,What year Vette ? , I have a 650 CFM double pumper on the shelf , my current set up is a 780 Holley with a quick secondary spring , that works great, when I first got my Vette 6 years ago I used the doublepumper & as I recall the double pumper had immidiate throttle response & was very responsive , but to small (cfm ) for my 433 engine...if the stock market recovers , will re/think the double pumper 800 cfm set up...........enjoy & drive your 502 :cheers: sounds like a great machine...............
[Modified by StrayDog, 7:18 AM 10/3/2001]
[Modified by StrayDog, 7:23 AM 10/3/2001]
[Modified by StrayDog, 7:25 AM 10/3/2001]
[Modified by StrayDog, 7:26 AM 10/3/2001]
[Modified by StrayDog, 7:18 AM 10/3/2001]
[Modified by StrayDog, 7:23 AM 10/3/2001]
[Modified by StrayDog, 7:25 AM 10/3/2001]
[Modified by StrayDog, 7:26 AM 10/3/2001]
Thread Starter
Instructor
Joined: Oct 2000
Posts: 126
Likes: 0
From: Leamington ON
Re: 502/ Demon Any Experiences (StrayDog)
Straydog the corvette is a 67 rag top with a t56/502. Staydog if you compare the appearance of a Demon vs Holley, you would think the Holley came from Junk Yard Wars.Appearance aside the Demon has an complete different mid range feel to it before you even get to the secondaries thats another ride :D
Cole :flag
Cole :flag
Drifting
Joined: Oct 2000
Posts: 1,642
Likes: 0
From: Boerne Texas
Re: 502/ Demon Any Experiences (Colevette)
Well, I have checked around...the Pro Gas racers across the street...and Mr. Wizard, member of the Gold Team and all around performance and timing wiz with the Scandanavian name up the road, and all say that the Demon carbs are simply the best going all around from performance to tech support. And build parts are readily available.... So.......my kid's college fund is going to shrink a very small amount in the near days (he has crumby grades and needs fewer brews anyway). :yesnod: :yesnod: :lol:
The Beast shall receive a new feedbag soon...... I will report back.
*******
Jeff
'66. L72
The Silver Beast
Keep on :seeya :seeya :flag :yesnod:
The Beast shall receive a new feedbag soon...... I will report back.
*******
Jeff
'66. L72
The Silver Beast
Keep on :seeya :seeya :flag :yesnod:
Safety Car
Joined: Feb 2000
Posts: 4,977
Likes: 38
From: Massachusetts , USA,
Re: 502/ Demon Any Experiences (67ratrag)
67 RAGTAG ,you are correct, as I limit myself to a 5700 RPM , self imposed red line on my , 427 , IE 433 (.O30 over ) , ,,, what other CFM from deamon on double pumper ??? 750 ???, available, the stock 780 HOLLY has been fine ,especially driveing in the fall as the choke system is excellant but your post indicates Deamon is an excellant option.,
Thread Starter
Instructor
Joined: Oct 2000
Posts: 126
Likes: 0
From: Leamington ON
Re: 502/ Demon Any Experiences (67ratrag)
Ratag great information,GM equips the 502 with a 850 as well that was what Demon's tech dept spec out for us. Also if you look at Demon's web site they show test that were done with less cfm carbs as compared to there competor's. Is your car running if so how is it going and what are you using for carbs?
Cole :flag
Cole :flag
Melting Slicks
Joined: Sep 1999
Posts: 2,712
Likes: 1
Re: 502/ Demon Any Experiences (Colevette)
My car has been held hostage for 3 yrs and 5 months at the place where it is being restored. Long story I will relate at another time. Let's just say I haven't the time to do it myself, and they keep losing suitable mechanics. That is it pretty much w/o the BS. The car gets worked on for short, intense bursts, then may sit for 6 months. My carb is a Holley 850 reworked by DaVinci carbs to a 1020 cfm unit. Engine is out of my old 69 SS Chevelle ragtop but is really a '71 LS6 w/ open chamber heads. Has a new rebuild as the 490 but has not been fired yet. One day.......I won't say soon, it will see pavement. :yesnod:
