WOW abrupt engine issues on new jasper.

supramacist · 06-10-2007, 07:08 PM

It's these cars man. It doesn't matter what you do to them they are just jinxed into the worst case scenario slot. This is the only logic I can lay on it.

Kuban · 06-10-2007, 07:35 PM

touche`

I looked deeper into it (LOVE DOING THAT ON SUNDAYS!!!! NOT!~@#$%^&), seems as though my pcv tube was kinked a bit kinda cutting off flow to the intake and ruining the vacume. I took it for a test drive and its not smoking anymore. But that doesnt change the fact that there are combustion gasses blowing by. It still sounds like it has a miss. But it does have standard plugs in it. So im going to put these iridium 9's i got chillin here in and change the oil. Might even do a comp test while the plugs are out. Ill keep ya all updated.

Kuban · 06-10-2007, 10:43 PM

Well i was talking to my toyo tech, he mentioned if the pcv airway was blocked for a long time, the excesive crankcase pressure could possibly crack a ring under a hard enough load. This coule be my issue. Anyone else think thats possible?

suprra_girl · 06-11-2007, 12:24 PM

if it was blocked then boost would be entering the block depths, it was only one run tho, and small blow by is normal

do a compression check and let us know the numbers

Kuban · 06-11-2007, 04:07 PM

Ran a comp test last night when i changed out the plugs. Numbers went as follow from 1-6

175
175
175
175
110
175

As you can see 175 for dry compression test is right where i want to be although cylender #5 is dead. Im guessing ring damage. Thing is, If the backpressure was so hard i would have blown seals on the engine long before i would have cause this kind of damage, but it happened noticeably right after the race. On the last engine when all the rings were gone, i litterally poped the front main seal off the last time i ran it. Dont get me wrong i dont beat my cars by any means. I baby them unless im racing someone and thats about once a week tops.

Looks like its time to call jasper and see if im warrentee.

supradaddy0803 · 06-11-2007, 06:44 PM

Well with all that increased pressure then you will have heat and if there was a backup then a soft part will go. Piston rings are strong up to a point but with more pressure than they can handle then they will fail. I had a PCV issue on my 86.5 and it ended up the head gasket was marked this side up on the wrong side and the oil drain back holes ended up being PCV vents pushing the gasket out. But with that low number on your #5 it has to be the rings if they got hot enough it may have coked oil in the ring grove and stuck the ring all the way in it could happen seen it on chevys before with a guy running nitrous and a supercharger kinda crappy really.

IHateHacks · 06-12-2007, 09:03 PM

So you are running 12psi on a stock fuel pump and stock injectors?

I personally think that is what caused your problem, too much boost not enough fuel, but its weird how only 1 cylinder got affected.

Either that or Jasper just don't make good 7M's.

06-10-2007, 07:35 PM	#2
Kuban 3" Exhaust Join Date: Feb 2007 Location: Milwaukee, WI Posts: 174	touche` I looked deeper into it (LOVE DOING THAT ON SUNDAYS!!!! NOT!~@#$%^&), seems as though my pcv tube was kinked a bit kinda cutting off flow to the intake and ruining the vacume. I took it for a test drive and its not smoking anymore. But that doesnt change the fact that there are combustion gasses blowing by. It still sounds like it has a miss. But it does have standard plugs in it. So im going to put these iridium 9's i got chillin here in and change the oil. Might even do a comp test while the plugs are out. Ill keep ya all updated. __________________ -868 Miles on new jasper engine -All hard pipes -0.57 trim ct-26 -greddy type S -greddy profec b -apexi ride high 7 way adjustables -eibach springs -slotted rotors -mkIV TT rims (front)245/45/17 (rear)285/40/17 -targa -greddy turbo timer -egr eliminated -3" turbo back, no cat, no resonator, Apexi N1 back. -n/a cams Theres others ill think of later.

06-10-2007, 10:43 PM	#3
Kuban 3" Exhaust Join Date: Feb 2007 Location: Milwaukee, WI Posts: 174	Well i was talking to my toyo tech, he mentioned if the pcv airway was blocked for a long time, the excesive crankcase pressure could possibly crack a ring under a hard enough load. This coule be my issue. Anyone else think thats possible? __________________ -868 Miles on new jasper engine -All hard pipes -0.57 trim ct-26 -greddy type S -greddy profec b -apexi ride high 7 way adjustables -eibach springs -slotted rotors -mkIV TT rims (front)245/45/17 (rear)285/40/17 -targa -greddy turbo timer -egr eliminated -3" turbo back, no cat, no resonator, Apexi N1 back. -n/a cams Theres others ill think of later.

06-11-2007, 12:24 PM	#4
suprra_girl 7M POWAH! ;) Join Date: Jun 2004 Location: New Zealand Posts: 2,312	if it was blocked then boost would be entering the block depths, it was only one run tho, and small blow by is normal do a compression check and let us know the numbers __________________ Please use the forum to ask your questions as they will get replied to much faster than pming me Pics of my build. "Good girls are just bad girls that don't get caught" Do a diagnostic first!

06-11-2007, 06:44 PM	#6
supradaddy0803 12psi boost Join Date: May 2006 Location: Athens, TX Posts: 308	Well with all that increased pressure then you will have heat and if there was a backup then a soft part will go. Piston rings are strong up to a point but with more pressure than they can handle then they will fail. I had a PCV issue on my 86.5 and it ended up the head gasket was marked this side up on the wrong side and the oil drain back holes ended up being PCV vents pushing the gasket out. But with that low number on your #5 it has to be the rings if they got hot enough it may have coked oil in the ring grove and stuck the ring all the way in it could happen seen it on chevys before with a guy running nitrous and a supercharger kinda crappy really. __________________ 1987 supra NA 5 speed 1JZGTE swap Tokico Illumina 2 and Eibach springs Tokico pillow blocks Suspension Techniques front and rear sway bar HKS super dragger cat-back exhaust plus test pipe Greddy Profec B spec 2 boost controller HKS type 1 turbo timer Supra sport solid steel drive shaft Walboro 255 fuel pump JZA70 Front end mod 18" Volk Racing AV3 18x8.5 front 18x9.5 rear

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06-10-2007, 07:08 PM	#1
supramacist 1000whp postwhore Join Date: Apr 2007 Location: Escape from the Prison Planet Posts: 1,356	It's these cars man. It doesn't matter what you do to them they are just jinxed into the worst case scenario slot. This is the only logic I can lay on it.

06-11-2007, 04:07 PM	#5
Kuban 3" Exhaust Join Date: Feb 2007 Location: Milwaukee, WI Posts: 174	Ran a comp test last night when i changed out the plugs. Numbers went as follow from 1-6 175 175 175 175 110 175 As you can see 175 for dry compression test is right where i want to be although cylender #5 is dead. Im guessing ring damage. Thing is, If the backpressure was so hard i would have blown seals on the engine long before i would have cause this kind of damage, but it happened noticeably right after the race. On the last engine when all the rings were gone, i litterally poped the front main seal off the last time i ran it. Dont get me wrong i dont beat my cars by any means. I baby them unless im racing someone and thats about once a week tops. Looks like its time to call jasper and see if im warrentee. __________________ -868 Miles on new jasper engine -All hard pipes -0.57 trim ct-26 -greddy type S -greddy profec b -apexi ride high 7 way adjustables -eibach springs -slotted rotors -mkIV TT rims (front)245/45/17 (rear)285/40/17 -targa -greddy turbo timer -egr eliminated -3" turbo back, no cat, no resonator, Apexi N1 back. -n/a cams Theres others ill think of later.

06-12-2007, 09:03 PM	#7
IHateHacks 20psi boost Join Date: May 2006 Location: New Haven/Hamden Posts: 793	So you are running 12psi on a stock fuel pump and stock injectors? I personally think that is what caused your problem, too much boost not enough fuel, but its weird how only 1 cylinder got affected. Either that or Jasper just don't make good 7M's.