Correct injectors? - Page 6 - ZR-1 Net Registry Forums

XfireZ51 · 05-06-2015

Quote:

Originally Posted by Jaap

Hi,

I just don`t understand why and how but the probem is solved and i`m very happy about it.

This aftenoon i changed the new ac spark plugs for the old Bosch super plus sparkplugs. And the LT5 ran inmediately very well and smooth.

When my son and i took it for a test drive it scared us both how fast the zr1 rides. Great fun.

thx for all the help.

Gr Jaap

OMG! If only we knew. Yes the Bosch plugs are crap. We have run into that same issue here.
Or are you saying you re-installed the Bosch plugs?

Franke · 05-06-2015

Jaap, that's good news. My opinion is that you should drive it awhile and then pull the plugs again especially on the 2,4,6,8 cylinders. (Funny how that's the right engine side.) You mentioned that those plugs 2,4,6 showed deteriorated electrodes and in an earlier post you said "When i bought the Z there was a constant white fog behind the car, that`s now gone". Sometimes a white fog is an indication of a coolant leak which you may have fixed. So it may be wise to inspect the plugs after awhile to see if all is well.

Jaap · 05-07-2015

Quote:

Originally Posted by XfireZ51

OMG! If only we knew. Yes the Bosch plugs are crap. We have run into that same issue here.
Or are you saying you re-installed the Bosch plugs?

Yes that`s what i`m saying XfireZ51, i reinstalled the Bosch plugs and it runs perfect. (don`t know for how long)

The new AC R41lt SP we installed broke down and i just don`t understand why..
I really would like to know.. but then again i shouldn`t worry about it too much and drive the ZR1

Paul Workman · 05-07-2015

Quote:

Originally Posted by Jaap

Yes that`s what i`m saying XfireZ51, i reinstalled the Bosch plugs and it runs perfect. (don`t know for how long)

The new AC R41lt SP we installed broke down and i just don`t understand why..
I really would like to know.. but then again i shouldn`t worry about it too much and drive the ZR1

Spark plugs breaking down?? That doesn't sound so good. Here is some information on evaluating spark plugs and heat ranges.

http://www.gnttype.org/techarea/engine/plugs.html

Upon the recommendation of Pete's (a well respected ZR-1 mechanic and racer) I installed the AC Delco 41 602 and have been using that plug for over 6 years with NO problems at all. (And, they cost much less than some more exotic plugs do - less than 1/2 a tank of gasoline; cost is low enough they can be replaced often to keep them always like new.

Also, compression checks should be done with the battery fully charged, and a battery charger connected to keep the battery at full charge between each cylinder test. Otherwise, what might look like low compression on some cylinders might be because the battery is becoming discharged.

I run my compression checks by taking my reading after equal number of compression strokes (5 to 7 compression strokes is usually enough to reach the peak, I find). And, I wait until the charging current from the charger drops down to 3 Amperes or less (fully charged) before testing again. That way I feel if I get a low reading it is NOT due to the battery being discharged.

Glad to hear it is running well. I'd want to keep an eye on those plugs for a while, to be sure there is nothing wrong with them.

Jitse · 05-07-2015

What about if the Catalytic converter is blocked/ damaged on the even bank....., and on the uneven bank not. Abnormal things are going to happen than. Like unstable engine load, more heat, which can damage the engine. He needs to look at his exhaust manifolds.

XfireZ51 · 05-07-2015

Quote:

Originally Posted by Jaap

Yes that`s what i`m saying XfireZ51, i reinstalled the Bosch plugs and it runs perfect. (don`t know for how long)

The new AC R41lt SP we installed broke down and i just don`t understand why..
I really would like to know.. but then again i shouldn`t worry about it too much and drive the ZR1

Jaap,

We've had the opposite experience happen here. Some installed exotic Bosch plugs and developed a miss. Not only on LT-5 but also BMW. AL-ZR1 can tell you about his experience w them. Installed stock plugs and bingo. I run NGK6E plugs on my LT-5 and never think twice about them,

Paul Workman · 05-07-2015

Quote:

Originally Posted by XfireZ51

Jaap,

We've had the opposite experience happen here. Some installed exotic Bosch plugs and developed a miss. Not only on LT-5 but also BMW. AL-ZR1 can tell you about his experience w them. Installed stock plugs and bingo. I run NGK6E plugs on my LT-5 and never think twice about them,

Q: Dom, did the plug heat range change with the big cams?

XfireZ51 · 05-07-2015

Quote:

Originally Posted by Paul Workman

Q: Dom, did the plug heat range change with the big cams?

Paul,

Actually made the change after porting.

05-06-2015	#52
Franke Join Date: May 2013 Location: Beaver, PA Posts: 516	Re: Correct injectors? Jaap, that's good news. My opinion is that you should drive it awhile and then pull the plugs again especially on the 2,4,6,8 cylinders. (Funny how that's the right engine side.) You mentioned that those plugs 2,4,6 showed deteriorated electrodes and in an earlier post you said "When i bought the Z there was a constant white fog behind the car, that`s now gone". Sometimes a white fog is an indication of a coolant leak which you may have fixed. So it may be wise to inspect the plugs after awhile to see if all is well.

05-07-2015	#55
Jitse Join Date: Aug 2013 Location: Holland Posts: 80	Re: Correct injectors? What about if the Catalytic converter is blocked/ damaged on the even bank....., and on the uneven bank not. Abnormal things are going to happen than. Like unstable engine load, more heat, which can damage the engine. He needs to look at his exhaust manifolds.