| Author | Message | ||
     Wolfridgerider |
anybody use the new Screamin' Eagle Hi-Comp plugs? | ||
| Ducxl |
What is different regarding "Hi-Comp"? My other bike is over 13:1 and this is news to me regarding the "hi-Comp" designation.Never seen it before. Snake oil......edit:IMHO spark plugs need only go BBBBBBBZZZZZZZZZZTTTTTTTTTTT!!! (Message edited by Ducxl on January 02, 2010) | ||
| Woody1911a1 |
"Snake oil......edit:IMHO spark plugs need only go BBBBBBBZZZZZZZZZZTTTTTTTTTTT!!! " Wrong ! years ago when i was wrenching for a living i was having a bit*h of a time diagnosing an ignition problem and we didn't have a scope yet , but we did have an old distributor machine so i literally took the entire ignition system out of the car and set it up on the dist. machine . spun it up and the plugs were fireing great . THEN my boss came over took this old plug tester off the shelf and hooked up compressed air plugged it in . 3rd plug we tested failed . lesson learned..... plugs under compression don't react the same as one's not . Cheers , Woody | ||
| Wolfridgerider |
Just a FYI Stock sporty is 8 to 1 Stock Buell is 10 to 1 | ||
| Ducxl |
I do not wish to distract from your original inquiry.I just question the benefits. Split fire,iridium,unobtanium etc. have,to me seemed like snake oil.Don't mean to be ignorant.From the books i've read,there's not much HP to be gained by fancy plugs.OR IS THERE??? | ||
| Saintly |
Woody is right. check this link out, about 1/4 of the way down you'll see under the heading "using a spark plug tester" http://www.splitdorfreg.com/Blancard/magproblems.h tml I worked at an old Kawi/Honda motorcycle dealer for a year. We had the exact same tester machine in our service department. I used it countless times to confirm that certain plugs were no good. Even brand new NGK's sometimes failed right out of the box. Although they spark in the open air, they could be dead as a doornail under pressure. I've seen it with my own eyes. | ||
| Xl1200r |
Just a FYI Stock sporty is 8 to 1 Stock Buell is 10 to 1 A stock 1200cc Sportster has been 9.7:1 since 2004. 883's are 8.9:1... not sure since when but I would guess 2004 as well. | ||
| Bluzm2 |
I had a spark failure this year like I've never seen before. The rear cylinder on my S2 started missing badly. I thought the wire had come dislodged or gone bad. I pulled into a gas station, stopped and check both wires. The rear was loose (or so I thought). I started it up again and heard the distinct sound of air puffing out of the rear cylinder. Turns out the ceramic inner part of the plug had come loose, you could actually move it up and down about 1/4" or so. I've been working on fossel fuel motors for 40 years, I've never had a plug do that before. BTW, who makes HD's plugs? Recently, I've noticed Champion plugs having leaks also. You can see it the base of the porcelain wher it meets the metal base. It looks like discolored streaks. I've kind of lost confidence in Champion plugs.. Brad | ||
| Just_ziptab |
I had one of those spark plug testers that you pumped up pressure on the plug and then gave it a zap. Thought I'd try it on my little pinky just to see hot the spark was. Attached the clip and just tapped the button for a little jolt...... It was one of those"Gracy the cat,licking my face" when I woke up......  | ||
| Queenofspeed |
higher compression motors usually benefit from a colder plug. That is what matters. | ||
| Fast1075 |
The standard Harley plugs are rebadged Champions...Over the years I have seen more defective new Champions than any other brand. In my youth, I worked a while at a tune-up center...we used Delco for GM engines, Autolite for Ford engines, Champion for Chrysler products and NGK for Japanese engines...and we kept a few Bosch plugs for the odd German car... We had little trouble from any of them expect the Champions...every month when the plug vendor brought his delivery, we turned in a couple dozen bad Champions... My pick for plugs is NGK and Autolite...they are consistantly high quality. The crazy multi electrode gimmick plugs are just that...in a lot of cases, they CREATE engine misses especially at low speeds...stick with conventional design. Exotic material plugs are a wise choice...the platinum and iridium plugs last a LOT longer because they wear more slowly and are more resistant to high combustion chamber temperatures. Simply changing plugs from one brand to another will not increase performance or power, etc....UNLESS the old plugs had issues and were misfiring to begin with. In that case, the appearant increase in power is simply the restoration of the ignition system to original performance levels. Note: The above recommendations and information applies to plugs that are of the appropriate heat range, reach and tip design that are properly gapped and correctly installed. I can safely and honestly say that I have used standard conventional NGK plugs (appropriate heat range and deburred)in a 1075cc I-4 engine that turned over 11K rpm under a 75+ hp nitrous load with no misfire as indicated by my data logger. | ||
| 46champ |
I have spent an entire career in aviation cleaning gapping and testing spark plugs. Testing with air pressure is an absolute necessity. The Champion rep told us years ago that if we wern't testing with 140psi we were wasting time. Several times we have had a miss on a running engine and when we tested the plug at 100 to 120 psi the plug was fine when we jacked the pressure up to 140 to 150 psi the plug failed, changed out the plug problem solved. Yes we do clean plugs in aviation the conventional plugs are $20 to $35 a piece and last 500 to 750 hours. The iridium plugs are $75 to $115 but they last 1200 to 2000 hours or just about the life of the engine. I'm sorry to here that people are having problems with Champion plugs in the automotive industry, in aviation they have been the best hands down for decades. Just checked Champion is owned by Federal-Mogul, Champion Aerospace is a separate company. | ||
| Wolfridgerider |
Well after all the posts.... I ordered a set of NGK's via my Amsoil account. | ||
| Fast1075 |
I am sure the aviation plugs have a LOT tighter quality control than automotive plugs. |
