Read my spark plug... - Page 4 - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 04-22-2011, 09:34 AM   #31
Registered Member
 
theholycow's Avatar
 
Join Date: Apr 2008
Posts: 6,624
Country: United States
Send a message via ICQ to theholycow Send a message via AIM to theholycow Send a message via MSN to theholycow Send a message via Yahoo to theholycow
Re: Read my spark plug...

Quote:
Originally Posted by Jay2TheRescue View Post
back it off a hare.
Is that an Easter joke?
__________________

__________________
This sig may return, some day.
theholycow is offline   Reply With Quote
Old 04-22-2011, 05:07 PM   #32
Site Team / Moderator
 
Jay2TheRescue's Avatar
 
Join Date: Sep 2008
Location: Northern Virginia
Posts: 4,657
Country: United States
Location: Northern Virginia
Re: Read my spark plug...

It could be...
__________________

__________________






Jay2TheRescue is offline   Reply With Quote
Old 04-23-2011, 04:30 PM   #33
Registered Member
 
bowtieguy's Avatar
 
Join Date: Oct 2008
Posts: 1,873
Country: United States
Location: orlando, florida
Re: Read my spark plug...

if he backs off the hare, can he then have feaster bunny to eat?
bowtieguy is offline   Reply With Quote
Old 04-23-2011, 04:32 PM   #34
Registered Member
 
theholycow's Avatar
 
Join Date: Apr 2008
Posts: 6,624
Country: United States
Send a message via ICQ to theholycow Send a message via AIM to theholycow Send a message via MSN to theholycow Send a message via Yahoo to theholycow
Re: Read my spark plug...

Ok, I think this is my list of things to try:

Higher octane fuel - I have a bottle of dollar store octane booster, I'll try it when I'm down to 1/4 tank or something...then after that maybe I'll invest in some actual expensive fuel.

Port vacuum instead of manifold. Probably will be worse.

Retard timing (wouldn't this reduce FE?).

CAI - I'm thinking I can put in a CAI and run direct manifold vacuum to the intake air door so it gets cold air at low vacuum (which should help with the knock) and air heated by the exhaust manifold at high vacuum (when there is no knock). Jay, didn't you do something like that?
__________________
This sig may return, some day.
theholycow is offline   Reply With Quote
Old 04-23-2011, 05:25 PM   #35
Registered Member
 
theholycow's Avatar
 
Join Date: Apr 2008
Posts: 6,624
Country: United States
Send a message via ICQ to theholycow Send a message via AIM to theholycow Send a message via MSN to theholycow Send a message via Yahoo to theholycow
Re: Read my spark plug...

Hey wait a minute...could EGR be involved? Failing EGR, for example, or maybe a modification I could do...
__________________
This sig may return, some day.
theholycow is offline   Reply With Quote
Old 04-23-2011, 06:28 PM   #36
Registered Member
 
GasSavers_Erik's Avatar
 
Join Date: Nov 2006
Posts: 1,027
Country: United States
Re: Read my spark plug...

Check the EGR diaphragm to see if it will still hold vacuum. Try hooking the EGR up directly to ported vacuum.

If the EGR passages are clear, when you reach up under the EGR diaphragm with your fingers while it is idling and manually pull the valve open, the engine should stall.

Spark knock will reduce mpg, so back off the timing a bit (rotate the distributor) if you hear a lot of it. The timing must be more advanced now than it was before or you would not hear the spark knock. So- the timing was too retarded before and now it is too advanced- you just need to find the happy medium for good mpg and very little spark knock.
GasSavers_Erik is offline   Reply With Quote
Old 04-23-2011, 07:03 PM   #37
Registered Member
 
theholycow's Avatar
 
Join Date: Apr 2008
Posts: 6,624
Country: United States
Send a message via ICQ to theholycow Send a message via AIM to theholycow Send a message via MSN to theholycow Send a message via Yahoo to theholycow
Re: Read my spark plug...

Quote:
Originally Posted by Erik View Post
The timing must be more advanced now than it was before or you would not hear the spark knock.
Possibly. It only comes with heavy throttle/low RPM - lugging.

Before the manual transmission: Can't lug an automatic, it'll downshift.

Before the vacuum modulator valve removal/manifold vacuum connection: Can't lug because it gets busy bucking first.

Now: Can go wide open at any RPM (well, until I back off because of knock).
__________________
This sig may return, some day.
theholycow is offline   Reply With Quote
Old 04-24-2011, 06:20 AM   #38
Registered Member
 
theholycow's Avatar
 
Join Date: Apr 2008
Posts: 6,624
Country: United States
Send a message via ICQ to theholycow Send a message via AIM to theholycow Send a message via MSN to theholycow Send a message via Yahoo to theholycow
Re: Read my spark plug...

I thought of another thing: If there's a lot of carbon buildup, my compression ratio could be artificially high.

So, my list, which I'll probably do in order of cheap and easy first...

- CAI
- carbon removal (Seafoam? Italian tune-up?)
- port vacuum (probably fail but it's way easy and free)
- EGR
- retard timing
- octane
__________________
This sig may return, some day.
theholycow is offline   Reply With Quote
Old 04-24-2011, 07:18 AM   #39
Site Team / Moderator
 
Jay2TheRescue's Avatar
 
Join Date: Sep 2008
Location: Northern Virginia
Posts: 4,657
Country: United States
Location: Northern Virginia
Re: Read my spark plug...

Quote:
Originally Posted by theholycow View Post

CAI - I'm thinking I can put in a CAI and run direct manifold vacuum to the intake air door so it gets cold air at low vacuum (which should help with the knock) and air heated by the exhaust manifold at high vacuum (when there is no knock). Jay, didn't you do something like that?

That's very close to the stock setup, except there's a thermal vacuum switch to keep the intake air at a steady temperature.
__________________






Jay2TheRescue is offline   Reply With Quote
Old 04-24-2011, 07:40 AM   #40
Registered Member
 
theholycow's Avatar
 
Join Date: Apr 2008
Posts: 6,624
Country: United States
Send a message via ICQ to theholycow Send a message via AIM to theholycow Send a message via MSN to theholycow Send a message via Yahoo to theholycow
Re: Read my spark plug...

Exactly. By removing the thermal vacuum switch it changes its behavior entirely, running as a HAI except when vacuum disappears. Also, there's no CAI in the stock setup, it gets warm engine bay air when it's not getting heated air.

So, I'd go from temperature-regulated air (no colder than engine bay air) to HAI/CAI based on vacuum.
__________________

__________________
This sig may return, some day.
theholycow is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
US / metric switching problems gory Fuelly Web Support and Community News 4 01-24-2011 03:04 AM
Tracking Monthly Fuel Expense Taser Fuelly Web Support and Community News 2 11-10-2009 12:40 AM
Halfway Home! '93 Civic CX tucsonron Transmissions and Running Gear 8 07-01-2009 09:45 AM
Civic VX L02 Ecu Cali GasSavers_maxpowers For Sale 0 09-27-2008 08:01 PM
1995 VX for $4500, is it worth it? Talerien General Discussion (Off-Topic) 4 06-12-2008 05:01 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 01:43 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.