How strong are stock rods and crank, how much can they take blown.

[60kmaintenance]

Yeah about that, how much can they take? This isn't a discussion over any thing else, I'm just curious about that, I've been dreaming up a way to make a SHO engine, well, insane. I don't have the money but maybe some one later will be interested in trying, for a track machine.

Are there aftermarket rods and crank? I might go down this road, but not for some time.

 

[yamahaSHO]

I've seen over 600 hp on the stock crank and rods... Not only were they stock, but the rods where lightened as well (casting taken off and ground smooth). The stock cast pistons are the ones that will break first.

 

[60kmaintenance]

Actaully a little grinding and shot-peening rods can make them stronger, it makes them more balanced and equal, which is better strain distribution. It's a very common thing in stock racing for circle track and other things.

Well my idea includes tossing the cast pistons any ways for some 8.5 compression alumi ones. Other things to do, electric steering pump, electric water pump, remove AC unit, all of that will allow up to probably 9-12krpm after balancing. I was also thinking about twin-turbocharging, having two where the current belts are for accesories, and battery area. Then making sheet metal intakes, one for each turbo with equal runners, and a small crossover tube. The vehical will be running very high PSI, I'm thinking custom fabricated valve covers that accomedate a girdle for the headbolts, as well as a girdle on the lower end, scrapping most of the oil pickup assembly except to use what's left and fabricate it up as a splash shield. The engine would use an outside oil pump in place of the power steering pump (side oiler), those pumps can handle the RPMs.

I haven't figured out the intercooler part to well, but I have seen a picture of a decent one on here, some how made into the front bumper.

 

[SHOnuff93]

When You Get All That Fabricated You Come Back And Let Us Know How Well It Works For Ya.

 

[60kmaintenance]

Might be awhile It's not that complicated really..... I Just don't have the desire to make my SHO into a track machine until I have some thing else to drive. That and I got to pay for college so spending money on the SHO, that kind of money, isn't in my interest atm.

Do you guys think the stock MTX transmission is good for it? (with upgrades from say SHO NUT)

I was inspired after watching Pat McGrath's 1991+ MTX track video's, looked like a little extra umph would of taken care of the 360 .

SHOnuff93 why do you capatilize every word?

 

[yamahaSHO]

The stock tranny will not take it... If you want to beef it up properly, you'll need a $6,000 gear set and a $1,200 differential. It won't be cheap.

BTW, Pat eventually passed that Ferrari, as well as a supercharged C5 Corvette, among other elite cars. Not to mention that was his heavier, less powerful street SHO

SHOnuff93 why do you capatilize every word?

He's not the only one.... or is he?

 

[60kmaintenance]

I thought he would of passed him, sure looked like he would of been ahead of him......

I did see him pass multiple things including a Cobra and Viper and older Ferrai I believe, was waching two videos from the Colorado SHO club website. Half the links don't work though, I wanted more!

Also dispite the cost of motor and tranny work, you figure in the base cost of a SHO (under $2.5k to start with), you've still got less in it then going and buying a new EVO or STI or what ever..... Your a LONG WAYS OFF from spending as much as a stock Corvette cost, which is sissy in comparrison after you upgrade.

One thing to note about SHO engines is that while the peak horse power and torque appear to be "less powerful" then some of those cars...... The range of it's power is WAY THE **** HIGHER then most engines, it has a VERY constant torque and horsepower curve after 3krpm, look at Pat's dyno, he's making a tid bit over 300hp just at 3krpm...... Trust me if they where like other engines you wouldn't be able to run a 14.7 stock in the 1/4 mile! My dad's Lincoln Continental has 260hp and 310lbs of torque with ******** way to far timing (so it won't brake transaxle) that only run's a 15.7 . The older H.O. Fox body mustangs had similiar (little more) peak power as the SHO and where about with the Lincoln on 1/4 mile times.

 

[yamahaSHO]

If you have AIM, I've got LOTS of Videos from Pat... VERY soon, Pat, Terry, Chris, and I will have some great SHO track videos

 

[60kmaintenance]

I do, CastAwayWi1son is my AIM.

Can't say no to some good SHO videos.

 

[LOUDSHO92]

Well my idea includes tossing the cast pistons any ways for some 8.5 compression alumi ones.

I think you will at least need forged ones, I dont think the aluminum ones will hold up. Also no one makes them.

Other things to do, electric steering pump, electric water pump, remove AC unit, all of that will allow up to probably 9-12krpm after balancing.

You will need to find units that work but that shouldnt be too hard. You will be experiencing valve float at around 9k so there is no point to go any higher. Also the peak hp is around 6k+ depending on mods. You wont need to go much higher as well. Underdrive pullies will allow you to reach around 8k which is what I have.

I was also thinking about twin-turbocharging, having two where the current belts are for accesories, and battery area.

You will not have much room still. I think to have any chace you will need to remove some sheet metal. One turbo has a hard enough time as it is fitting.

I'm thinking custom fabricated valve covers that accomedate a girdle for the headbolts, as well as a girdle on the lower end, scrapping most of the oil pickup assembly except to use what's left and fabricate it up as a splash shield.

Good luck on the fabrications. Why a need for a gridle for the head bolts? There already is one on the lower end that does a pretty good job.

The engine would use an outside oil pump in place of the power steering pump (side oiler), those pumps can handle the RPMs.

I though you needed the room? I am not sure how how high the stock goes but I think it will do well. It is on the crank.

 

[yamahaSHO]

I think you will at least need forged ones, I dont think the aluminum ones will hold up. Also no one makes them.

The forged pistons are aluminum. As are our cast pistons.

You will need to find units that work but that shouldnt be too hard. You will be experiencing valve float at around 9k so there is no point to go any higher. Also the peak hp is around 6k+ depending on mods. You wont need to go much higher as well. Underdrive pullies will allow you to reach around 8k which is what I have.

With a centrifugal blower, a stock motor will make power FAR past 7k rpm.

 

[60kmaintenance]

Forged pistons are usually aluminum.....

I think some stiffer springs should fix the floating problem.

Peak HP N/A your talking about, with forced induction, and new cams, way more potential.

Yeah there isn't much room for the turbos, I know, but I'm sure it can be done some how! Not like there will be a heater core or need for passenger foot room, battery relocation..... Remmeber the turbos won't be huge, as there will be two.

Head bolt girdle is just an idea, unless some good aftermarket head bolts would work. With all that PSI pushed into the cylinder...... Yes some thing would be a good precaution, people have blown heads off vehicals MANY times using forced induction of MANY type of vehicals. Not just pro-drag.

I know room with out the steering pump would be nice, I however..... Considered there wouldn't be any justice for any thing short of a side oiler for heavy track use. This isn't JUST for the RPM concern, which the inside pump may not work well for a long time past 8krpms....... It also will push more oil, and you can create a pressurized system, it can help a lot with high RPM's.

 

[yamahaSHO]

For stiffer springs, you'll have to have them custom fabricated... I know of a few *good* sets that were made, but they are taken and were not cheap. I used to have a set of SHO Shop springs, but I sold them for the fact that they break.

There is a local SHO with 17PSI and has not blown a head off the block, and it is a pure track car.

 

[60kmaintenance]

I was thinking higher then 17psi This is a pretty all out dream.

 

[yamahaSHO]

The same said SHO will be running even more boost with the same motor... just a smaller pulley and water injection.... We've done a lot with SHO's and people in the SHO community are still advancing.

There are plenty SHO buggies out there making in excess of 600-700hp with boost...

 

[60kmaintenance]

Yeah, they are pretty awsome engines least to say.

 

[LOUDSHO92]

The forged pistons are aluminum. As are our cast pistons.

I guess I still need to learn a few things.

With a centrifugal blower, a stock motor will make power FAR past 7k rpm.

True but you will still have valve float as a problem though.

The head bolts have been doing pretty good. You can still find some stonger bolts if need be.

 

[yamahaSHO]

8k on stock springs and stage 1 cams with no valve float problems here

 

[stevemainian]

I guess I still need to learn a few things.



True but you will still have valve float as a problem though.

The head bolts have been doing pretty good. You can still find some stonger bolts if need be.

I thought the point of overhead cams was no valve floating?? Rockers will eventually start floating, but i didnt think ohc's would have the same problems.

 

[LOUDSHO92]

I realise you will have no problem with 8k. I am talking about 9k+

I have 8k with stage 1s and still no problem.

You will have valve float it is justa matter of what RPM it will occur at depending the springs and the engine.