spark plug gap

65

Asked by Oct 20, 2008 at 06:44 PM about the 2005 Ford Mustang GT Deluxe

Question type: Maintenance & Repair

What is the spark plug gap recommended for the magna supercharger installation for the 2005 Mustang GT to prevent detonation?

So far I have two different answers. From magna installation manual with the supercharger they recommend original gap, but in an article published in Modified Mustang the Magna supercharger factory rep ended up changing the gap on the plugs. Sp which one is it?

6 Answers

3,225

If you're using platinum plugs, only gap them if you want to destroy the plug and go buy new ones. If you're using copper plugs, you should use what Magna says.

345

What were the two gap ranges. When vehicles are boosted you want to run a smaller gap, but I would like to hear what the two of them are.

65

Sorry for the late reply Andrew, I had difficulty locating the article from my magazine collection. Anyhow, in the "Mustang and Fast Ford Mag, June 2008 they talk about all blowers. The one in question here, is suggested by the factory rep from magnusson to change the original spark plug ( HT1 gapped at 0.045-inch) to HT0's gapped at 0.030 inch. They mention that anytime more than 4 pounds of boost is seen in force induction engine the spark has tendency to be blown out, hence the reduced gap as you mentioned as well. In the installation book for the same magnusson blower, they recommend to keep the original spark plugs. So I am a little puzzled here. Why would the installation manual not recommend a smaller gapped plug?

345

Ok...did they say keep the original spark plugs or the original spark plug gaps? If they say spark plugs you may use the original spark plugs just make the gap tighter. When they talk about the spark being blown out, that is true. The reason you have a such a substantial gap change is going from a naturally aspirated motor to a "boosted" motor. I have a Mitsubishi Eclipse GST I have upped the boost and in doing so lessened the gap. Im not familiar with Mustangs but do you have system to datalog with. You wil definately know if your knocking. 0.30 doesnt sound too bad.

65

I am going to go with the 0,30 gap and see where it goes. I will let you know how much extra ponies I am putting to the pavement after this blower is installed. I can not wait to see this monster awaken my 4.6L.

345

Make sure you get those HT0 plugs. They will be a step colder than stock and then gap them at 0.030 Good Luck and have fun.

Your Answer

Add photo

Related Questions

Mustang

Looking for a Used Mustang in your area?

CarGurus has 44,403 nationwide Mustang listings starting at $1,000.

ZIP:

Search Ford Mustang Questions

Ford Mustang Experts

#1 Tom Demyan
Tom Demyan
Reputation 4,050
#2 FordNut
FordNut
Reputation 1,230
#3 Bob Beaman
Bob Beaman
Reputation 1,100
View All

Related Models For Sale

Used Dodge Charger
395 Great Deals out of 30,065 listings starting at $2,343
Used Chevrolet Corvette
201 Great Deals out of 20,888 listings starting at $4,993
Used Ford Mustang SVT Cobra
7 Great Deals out of 278 listings starting at $5,900
Used Ford F-150
2,878 Great Deals out of 212,656 listings starting at $1,000
Used BMW 3 Series
1,468 Great Deals out of 38,438 listings starting at $1,700
Used Jeep Wrangler
442 Great Deals out of 19,188 listings starting at $2,994
Used Chevrolet Silverado 1500
2,307 Great Deals out of 156,238 listings starting at $1,395
Used Nissan 350Z
81 Great Deals out of 1,508 listings starting at $3,988
Used Honda Accord
885 Great Deals out of 82,090 listings starting at $999
Used Honda Civic
705 Great Deals out of 77,526 listings starting at $1,200

Used Cars For Sale

2017 Ford Mustang For Sale
6 Great Deals out of 21,813 listings starting at $18,490
2016 Ford Mustang For Sale
50 Great Deals out of 3,831 listings starting at $16,999
2015 Ford Mustang For Sale
58 Great Deals out of 3,293 listings starting at $14,999
2014 Ford Mustang For Sale
50 Great Deals out of 2,894 listings starting at $9,499
2013 Ford Mustang For Sale
29 Great Deals out of 1,255 listings starting at $9,000