Big power on built mark viii block?

[F1erceK]

put it like this.... I have a forged, 8 bolt crank in my NA marauder. So theres no reason why you shouldnt have one either.

This ^

When I built mine I built with the idea of sustaining 700+whp, I like to think I succeeded. I knew boost could happen, but you never know in life so my built motor started out NA. Build your bottom end for your end-game goal, otherwise it will cost a lot more over time. Make sure you gap your rings accordingly! .016-.020 is for NA, not for 700whp. I believe .025-.028 is what you want for those numbers, but your builder should know. If he says NA ring gap is fine for big power, he's wrong.

[minimarine09]

It will work fine. Skip the knock sensor its a waste of time. I obsessed over it for a short period, glad I didn't let it cost me any money. One of the motor mount locations will need some aluminum removed in order for one of the mounts to bolt on properly, I don't recall which side. You can use either the marauder crank gears and timing sensor sprocket, or the set from the mark8, you cannot mix them - you will see why when compared. Feel free to PM me if you need.

Any particular reason why people are ditching knock sensors?

put it like this.... I have a forged, 8 bolt crank in my NA marauder. So theres no reason why you shouldnt have one either.

Lol n/a? But why though lol how high are you revving?

[Chayton]

Any particular reason why people are ditching knock sensors?



Lol n/a? But why though lol how high are you revving?

over 9 thousand

[Turbov6Bryan]

over 9 thousand

But when vtec kicks in, it's the second 100 horse!

[Guittard22]

I would not attempt to push a cast crank past 600 at the wheels, 700 rwhp on a cast crank will be on borrowed time.

How about 617 hp lol

[FordNut]

Keep in mind what the ultimate goal is. A street car or a track car. High compression and boost could put you in a race gas only situation. It's not readily available in my neighborhood.

[loud2004marquis]

Any insight to the limits of 93 octane?

[Mr. Man]

Any insight to the limits of 93 octane?

Read this. It won't specifically answer your question, but it will give you some incite to your question.

http://www.badasscars.com/index.cfm/...rod/prd391.htm

[SGT_MERC]

Great article...

[minimarine09]

Keep in mind what the ultimate goal is. A street car or a track car. High compression and boost could put you in a race gas only situation. It's not readily available in my neighborhood.

If I can't do it with 93 and a bunch of meth, then I'll do it with e85. Gotta love that corn juice

[minimarine09]

This ^

When I built mine I built with the idea of sustaining 700+whp, I like to think I succeeded. I knew boost could happen, but you never know in life so my built motor started out NA. Build your bottom end for your end-game goal, otherwise it will cost a lot more over time. Make sure you gap your rings accordingly! .016-.020 is for NA, not for 700whp. I believe .025-.028 is what you want for those numbers, but your builder should know. If he says NA ring gap is fine for big power, he's wrong.

I build my own motors, normally for ring gap I'll just consult the piston manufacturer if the provided spec card they provide is questionable

[loud2004marquis]

^^^interesting read^^^ makes me wonder what the typical drawbacks of our oem engine's design are. Have heard lots of comments over the years of the rotating assembly being a weak point. Article mentioned many more variables to consider...what other variables are there to consider that people have addressed in building our oem engine for boost on 93? Would be nice to keep our lighter weight aluminum block as compared to an iron block.

[FordNut]

Any particular reason why people are ditching knock sensors?

Some tuners turn them off anyway, so they don't need to be installed.

Mine is installed and turned on in the tune, the sensitivity is turned down so false knock doesn't trigger the tune to pull timing.

Forged pistons and loose clearances needed for supercharged engines creates some noise, especially on cold starts.

[Zack]

I build my own motors, normally for ring gap I'll just consult the piston manufacturer if the provided spec card they provide is questionable

Any boosted car should have a second ring gap at .024, Not what the mfg suggests

[minimarine09]

Any boosted car should have a second ring gap at .024, Not what the mfg suggests

um, i believe the different expanding rates, at different temperatures, at different power levels, with different materials, that different manufactures use, may vary the ring gap on different setups... id rather trust an aftermarket piston company that has spent years and MILLIONS of dollars on r&d. just my .02 though.