I've got a intercooled Vortech SQ pushing 8 pounds of boost into my Mark and I love it! I've never had a supercharged car before. However, I need more power (the story of my life). The engine is stock and has 90K miles. Would 10 pounds of boost cause engine problems? I have ART long tube headers and no cats.
BOOST! How much is too much?
- Thread starter JC
- Start date
It all depends on the tuner if they are willing to push it that far. I have a Reichard Racing 3.1 pulley on mine and it hits 10 psi at 7150 RPM. Aric was able to get 401rwhp from my Vortech SQ/SC HO trim air to air intercooled, 05 GT blow through MAF, 60# injectors, SVT Focus fuel pump w/KB BAP. Stock bottom end w/ 108k on the clock.
Supercharged Lincoln Mark VIII Dyno Tune
Supercharged Lincoln Mark VIII Dyno Tune
Roadboss
On Work Release
Jack- it's time to join the rest of us and step up to the "full boogie". Get yourself that early retirement gift!! You know, the one you been holden back all those years for.
With Lonnie and Dennis down near you you should have no problems getting the answer to your question, it'll be just a case of how big a present you think you deserve. I just got a plain "gold watch" for myself while Mike is building a "fully jeweled diamond watch". LOL
With Lonnie and Dennis down near you you should have no problems getting the answer to your question, it'll be just a case of how big a present you think you deserve. I just got a plain "gold watch" for myself while Mike is building a "fully jeweled diamond watch". LOL
Lonnie, I thought you told me that 450 rwhp is safe for a blown engine and 475 rwhp is safe for a turbo'd engine? Has some new info come out about these engines that I should know about?
Sean Hyland is pretty clear that you will probably have problems with a stock 4.6 Teksid block above 400 horsepower, with 450 being the absolute top limit. 400 is about as far as you can go and keep a good measure of reliability without going to forged internals.
If you swap out the internals for forged, then the limit raises to insane levels (1500 horsepower).
Everything that I have read says that 8 PSI is safe, 9 is pushing it, and 10+ is asking for trouble.
If you swap out the internals for forged, then the limit raises to insane levels (1500 horsepower).
Everything that I have read says that 8 PSI is safe, 9 is pushing it, and 10+ is asking for trouble.
Not doubting anyone here. It's just that I was told differently by other Mark VIII experts.
Well, Sean Hyland isn't actually a Mark VIII guy, he's a 4.6 liter guy, and he builds race motors so:
1) His experience is with the 4.6 line as a broad spectrum, not specifically the Mark VIII motor.
2) He builds racing engines which probably are put under a greater strain (max output) for a longer period than our daily drivers, and if one breaks it makes him look bad, so he undoubtedly overbuilds to keep that from happening.
3) Early "Teksid" 4.6s (93s and early 94s) were hand poured and hand cooled by Teksid themselves, and so I would expect they are stronger internally, which may be why one motor can handle more boost and another can't, yet both be in the hands of knowledgeable Mark VIII people.
All in all, it's YOUR motor and ultimately it's your decision. So if you boost the thing to 12 pounds and it holds together over an extended period, that's good on you. I only responded because you were asking what the safe boost limit is, and from what I read (not personal experience) 8 or 9 pounds with stock internals is pretty much it.
1) His experience is with the 4.6 line as a broad spectrum, not specifically the Mark VIII motor.
2) He builds racing engines which probably are put under a greater strain (max output) for a longer period than our daily drivers, and if one breaks it makes him look bad, so he undoubtedly overbuilds to keep that from happening.
3) Early "Teksid" 4.6s (93s and early 94s) were hand poured and hand cooled by Teksid themselves, and so I would expect they are stronger internally, which may be why one motor can handle more boost and another can't, yet both be in the hands of knowledgeable Mark VIII people.
All in all, it's YOUR motor and ultimately it's your decision. So if you boost the thing to 12 pounds and it holds together over an extended period, that's good on you. I only responded because you were asking what the safe boost limit is, and from what I read (not personal experience) 8 or 9 pounds with stock internals is pretty much it.
I will say, a super charged Mark VIII is a hoot to own and drive. I enjoy, and appreciate the Mark much more than the Cobra Mustang I modeled my build after. Additionally, I am glad that I am replacing the stock Mark engine with a bored and stroked Cobra Teksid block, heads, and cams. Makes me feel better when going after more power.
I enjoy, and appreciate the Mark much more than the Cobra Mustang I modeled my build after. Additionally, I am glad that I am replacing the stock Mark engine with a bored and stroked Cobra Teksid block, heads, and cams. Makes me feel better when going after more power.
Lonnie, I thought you told me that 450 rwhp is safe for a blown engine and 475 rwhp is safe for a turbo'd engine? Has some new info come out about these engines that I should know about?
Watch your converter too...
I've got Lonnie's carbon fiber converter hooked up through his stage 3 transmission.
He practically dares me to TRY and break it...
My setup is also being used in a low 10 second Mustang that he knows about.
BlackMark8
Registered
I just think its crazy that you can have a supercharged mark viii with 400+ RWHP and driller has a naturally aspirated car with 250 RWHP and run a low to mid 13's. When the supercharger just barely gets you into 12's .
And who is that guy with that black 98 lsc with that big vortec and runs low 11's. Is that guy a member of LOD ?
And who is that guy with that black 98 lsc with that big vortec and runs low 11's. Is that guy a member of LOD ?
Driller is doing an excellent job of putting power to the ground. SO much time can be gained/lost in the first 60 feet, and he is obviously the king of the small end of the track.
On top of that, it takes more and more and more power for each 1/10th you take off. Drag racing is so much more than just mashing your foot to the floor and holding on.
On top of that, it takes more and more and more power for each 1/10th you take off. Drag racing is so much more than just mashing your foot to the floor and holding on.