oil in intake system
01-30-2004, 06:56 AM
#1
Essential Speed
Thread Starter
Join Date: Dec 2003
Location: cambridge,ont. Canada
Posts: 70
Likes: 0
Received 0 Likes
on
0 Posts
oil in intake system
hello, has anyone found oil in their intake system yet?
Mazda is asking for it back.When we pulled it apart to build our twin intake system, we where suprised to find almost 100mm of oil in the intake tube.My stock filter was soaked in oil with a puddle in the stock box.
I have made it known to our RX8 CUSTOMERS TO CHECK THEIR INTAKE SYSTEM.
has anyone come across this?
Mazda is asking for it back.When we pulled it apart to build our twin intake system, we where suprised to find almost 100mm of oil in the intake tube.My stock filter was soaked in oil with a puddle in the stock box.
I have made it known to our RX8 CUSTOMERS TO CHECK THEIR INTAKE SYSTEM.
has anyone come across this?
01-30-2004, 04:10 PM
#4
Essential Speed
Thread Starter
Join Date: Dec 2003
Location: cambridge,ont. Canada
Posts: 70
Likes: 0
Received 0 Likes
on
0 Posts
Actual i picked it up fro the dealer...drove 1500kms.
pulled the intake off to do our prototype and found this..the oil was actually down 1.5L!!
i know the new rotary is higher compression..maybe too much blow by..after all the rxb has 3 crankcase vent tube running into the intake piping
the car also boggs leaving the stop sign at low rpms...
pulled the intake off to do our prototype and found this..the oil was actually down 1.5L!!
i know the new rotary is higher compression..maybe too much blow by..after all the rxb has 3 crankcase vent tube running into the intake piping
the car also boggs leaving the stop sign at low rpms...
01-30-2004, 05:34 PM
#5
Registered User
Join Date: Aug 2003
Location: Wisconsin
Posts: 89
Likes: 0
Received 0 Likes
on
0 Posts
Check out my thread with photos. Mine wasn't as bad as yours, just a bit on the filter, but a bunch in the intake tube.
https://www.rx8club.com/series-i-tech-garage-22/oil-air-box-19733/
https://www.rx8club.com/series-i-tech-garage-22/oil-air-box-19733/
01-31-2004, 03:02 PM
#6
"...I'm a Dapper Dan man"
I just checked my car during the oil change and my system is dry as a bone. I think your car may have been over filled causing some oil to be sucked into the PVC system.
01-31-2004, 04:04 PM
#7
Moderator
Join Date: Jan 2002
Location: Goffstown, NH
Posts: 1,281
Likes: 0
Received 0 Likes
on
0 Posts
Please follow this thread and add comments here: https://www.rx8club.com/showthread.p...=oil+in+intake
Omnicron and myself both had the bad oil cooler hose issue where it leaked and blew oil on the air filter and intake track. I noticed the same thing when I replaced my stock air box with a K&N Typhoon intake.
Get it looked at the dealer asap, seems like a classic faulty oil cooler hose/fitting.
Omnicron and myself both had the bad oil cooler hose issue where it leaked and blew oil on the air filter and intake track. I noticed the same thing when I replaced my stock air box with a K&N Typhoon intake.
Get it looked at the dealer asap, seems like a classic faulty oil cooler hose/fitting.
01-31-2004, 08:16 PM
#9
Whaaaa?
Join Date: Aug 2003
Location: San Diego, CA
Posts: 623
Likes: 0
Received 0 Likes
on
0 Posts
Also I'm sure the PCV stuff vents to the engine side of the throttle plates where there's generally always vacuum. I can't imagine how oil would get into the intake near the filter and up the intake tube other than if it was being sprayed in the intake somehow, as has been suggested via the leaky oil cooler line.
On the FD rx-7 it's a bit different because the blowoff valves vent into the airbox (in a stock configuration) and can generate oil there. Also on the engine side of the turbos you can get some oil also. In the rx8 there's really nothing that connects to the intake prior to the throttlebody that would generate oil, at least that I've been able to see. So if there's oil in the early part of the intake tract it's definately worth investigating the source.
On the FD rx-7 it's a bit different because the blowoff valves vent into the airbox (in a stock configuration) and can generate oil there. Also on the engine side of the turbos you can get some oil also. In the rx8 there's really nothing that connects to the intake prior to the throttlebody that would generate oil, at least that I've been able to see. So if there's oil in the early part of the intake tract it's definately worth investigating the source.
01-31-2004, 09:47 PM
#10
"...I'm a Dapper Dan man"
Originally posted by XCENTRIC
It's PCV (Positive Crankcase Ventilation). NOT PVC (which is mostly used for drainage systems in buildings).. :D
It's PCV (Positive Crankcase Ventilation). NOT PVC (which is mostly used for drainage systems in buildings).. :D
PCV!
The air filter is clean.
02-06-2004, 10:18 PM
#12
Registered
Join Date: Jul 2003
Location: Richland WA
Posts: 284
Likes: 0
Received 0 Likes
on
0 Posts
I had Mazda look at the oil in the intake tube today. Unfortunately, by time I called them this evening the mechanic had gone home. However , the service desk guy told me that the mechanic said it was normal to have oil in "that" area. The service guy could not tell me how oil gets into the intake so I will talk to the mechanic on Monday to get an answer.
Last edited by Rick; 02-06-2004 at 10:22 PM.
02-09-2004, 07:07 PM
#13
Registered
Join Date: Jul 2003
Location: Richland WA
Posts: 284
Likes: 0
Received 0 Likes
on
0 Posts
The mechanic said a SMALL amount of oil in the intake is normal and that it comes from the oil injectors. He then said something about the overlap design of the side port reverses part of the intake charge and that is how the oil gets in there. Does that make sense?
He sounded credible until he told me that it also happens to the FDs. I thought oil in the FD intake was fron worn out turbos
He sounded credible until he told me that it also happens to the FDs. I thought oil in the FD intake was fron worn out turbos
02-09-2004, 07:30 PM
#14
Essential Speed
Thread Starter
Join Date: Dec 2003
Location: cambridge,ont. Canada
Posts: 70
Likes: 0
Received 0 Likes
on
0 Posts
My baby gt is going in tommorrow to get looked at.
Mazda Canada sent a techy down to look at it.
The comment of it "being normal"..doesn't jive with me.Yes the second and third gen. in fact all rotaries burn some oil...thats fine and espected.
But throwing oil into the intake track...so much that my air box,filter and intake tube is soaked with oil.
Lossing so much that in the 1200km i have driven since pick up gone through over 2L of oil.FOR the record it was never over filled.Since i found the issue i have added over 750ml of oil to my motor.
if they can't solve it i have fabricated a catch can to intervine with the crankcase vent tubes.
ON a side note...anybody found their 8 to be sluggish from idle to 1500 rpm, as in when you pull away from a stop sign..and have to feather the gas pedal so the rpms don't crash???.
Mazda has done a great job with the low end torque but i found the car in the upper gears doesn't have the pull it should have, hopefully our intake and exhaust upgrades will fix that issue.
Mazda Canada sent a techy down to look at it.
The comment of it "being normal"..doesn't jive with me.Yes the second and third gen. in fact all rotaries burn some oil...thats fine and espected.
But throwing oil into the intake track...so much that my air box,filter and intake tube is soaked with oil.
Lossing so much that in the 1200km i have driven since pick up gone through over 2L of oil.FOR the record it was never over filled.Since i found the issue i have added over 750ml of oil to my motor.
if they can't solve it i have fabricated a catch can to intervine with the crankcase vent tubes.
ON a side note...anybody found their 8 to be sluggish from idle to 1500 rpm, as in when you pull away from a stop sign..and have to feather the gas pedal so the rpms don't crash???.
Mazda has done a great job with the low end torque but i found the car in the upper gears doesn't have the pull it should have, hopefully our intake and exhaust upgrades will fix that issue.
02-09-2004, 07:32 PM
#15
Administrator
Originally posted by essentialspeed
ON a side note...anybody found their 8 to be sluggish from idle to 1500 rpm, as in when you pull away from a stop sign..and have to feather the gas pedal so the rpms don't crash???.
Mazda has done a great job with the low end torque but i found the car in the upper gears doesn't have the pull it should have, hopefully our intake and exhaust upgrades will fix that issue.
ON a side note...anybody found their 8 to be sluggish from idle to 1500 rpm, as in when you pull away from a stop sign..and have to feather the gas pedal so the rpms don't crash???.
Mazda has done a great job with the low end torque but i found the car in the upper gears doesn't have the pull it should have, hopefully our intake and exhaust upgrades will fix that issue.
02-09-2004, 09:14 PM
#16
Essential Speed
Thread Starter
Join Date: Dec 2003
Location: cambridge,ont. Canada
Posts: 70
Likes: 0
Received 0 Likes
on
0 Posts
coming out of highway cruise 6spd.. @ 3000rpm.
drop down to 4th...around 4000 and punch it..it pulls but not impressive.
I know i'm used to 31 psi of boost in my second gen...but the 8 feels that its very restrictive in the mid to high rpm range.
I'm wondering if in Mazda's redesign they sacraficied top end for low end pull??
If you have looked at other dyno for the rx8 with performance mods..they post gains from mid upward.
As in most N/A rx's they need alot of help to let the rotary breath...cold air intake and exhaust always gave the best gain for your buck.
Hoping our mods will bring the "scream " back into the rx8
drop down to 4th...around 4000 and punch it..it pulls but not impressive.
I know i'm used to 31 psi of boost in my second gen...but the 8 feels that its very restrictive in the mid to high rpm range.
I'm wondering if in Mazda's redesign they sacraficied top end for low end pull??
If you have looked at other dyno for the rx8 with performance mods..they post gains from mid upward.
As in most N/A rx's they need alot of help to let the rotary breath...cold air intake and exhaust always gave the best gain for your buck.
Hoping our mods will bring the "scream " back into the rx8
02-09-2004, 10:28 PM
#17
Administrator
well check some posts here that talk about the ecu, intake and exhaust. you'll find that the intake and exhaust are very well engineered on this car and that the restriciton is mostly in the ecu. not much gain from intakes and exhaust on this car. the problem is the "cat-longevity" state of tune which is causing it to run "pig-rich"(thanks to paul yaw
) in th eupper rpm ranges. and yes it doesn't have much punch at 3k rpm in 6th but then that is purely an overdrive gear, so it is as it is supposed to be. shifting to 4th is definetly the way to go in that situation if you want to pass.
) in th eupper rpm ranges. and yes it doesn't have much punch at 3k rpm in 6th but then that is purely an overdrive gear, so it is as it is supposed to be. shifting to 4th is definetly the way to go in that situation if you want to pass.
02-09-2004, 11:52 PM
#18
Registered
Join Date: Aug 2002
Location: Navarre, FL
Posts: 994
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by Rick
He then said something about the overlap design of the side port reverses part of the intake charge and that is how the oil gets in there. Does that make sense?
He then said something about the overlap design of the side port reverses part of the intake charge and that is how the oil gets in there. Does that make sense?
Thread
Thread Starter
Forum
Replies
Last Post
Sifu
RX-8 Parts For Sale/Wanted
3
08-30-2015 10:51 PM
akagc
RX-8's For Sale/Wanted
7
08-11-2015 07:07 PM
