951 in my 750sx freestyle buildup

[Brian_216]

here come pics! I made the new rear mount plate today, the stock one mounted backwards put the mounting feet almost on the mounts, I had them shimmed up about 1 1/2 inces to line up with the driveshaft. so I took that and ran with it. I rigged up an old scroll saw with a hacksaw blade and went to town. I think it came out great. its 1/4 inch aluminum. and yes im welding in triangular gussets at the bottom where the mounting tabs are bent out.

 

[Crab]

here come pics! I made the new rear mount plate today, the stock one mounted backwards put the mounting feet almost on the mounts, I had them shimmed up about 1 1/2 inces to line up with the driveshaft. so I took that and ran with it. I rigged up an old scroll saw with a hacksaw blade and went to town. I think it came out great. its 1/4 inch aluminum.

Looks good, hope it will handle the torque.

 

[Brian_216]

I may just weld a 1/2 inch wide strip across the top of the whole thing to make it even stronger. its some pretty tough aluminum, it took heat to put the bends in it. (Its what we use to fix Fed Ex trucks at work when they come in for collision repair.)

 

[WFO Speedracer]

It looks like it needed to be slightly longer to catch more of the stock engine mount,nice fab work though.

 

[Brian_216]

It looks like it needed to be slightly longer to catch more of the stock engine mount,nice fab work though.

thats what big washers are for! Im with ya tho, I thought the same thing when I set it in there. It was hard to judge when I had blocks of wood under the stock plate. I think it will be ok.

 

[SXR-FOREVER]

I like your idea for the bracket! Looks good. How does the front of the 951's mount?

 

[madscientist]

single front mount that will have to be glassed in

 

[Brian_216]

yea, and the front mount falls on a curved part of the hull. I think im going to bend up plate, cut the contours of the hull and bend out tabs to be glassed in. That way I can cover the whole thing in glass for strength. The block of 2x4 thats in there now isnt going to make it.

 

[x2skier]

The block of 2x4 thats in there now isnt going to make it.

Lowe's sells a fine line of pressure treated lumber.

 

[SXR-FOREVER]

if you get a chance can you take a picture of where it mounts in the front?

 

[Brian_216]

Ill get a pic of it tonight when I get home.

 

[Brian_216]

sorry it took me forever to post the pics, its been stressfull. I tore into this motor to find out it needs more than I thought. Ive been kinda bummed and almost threw the project out. The head and bottom of the cylinder are corroded bad, the head Im pretty sure is un-useable, and the bottom of the cylinders may be able to be machined. Its a good thing I won the Rossier head I was bidding on. (Im still kinda bummed about the motor.) I stuck it all back together to finish mocking up everything.

 

[WFO Speedracer]

Ok at this point I need to make a suggestion,you need to check your squish with that head installed,there are different thickness base gaskets available to adjust the squish but you have to know how much squish you have right now to know how much if any you can safely machine off the bottom of that cylinder.

 

[Brian_216]

yea thats on my list of things to do. that and the 8 million things that need to be fabbed. Im right now trying to buy a TIG welder so I can do my own aluminum. its either that or buy the rest of what I need for this project. I have until march or april anyway.

 

[WFO Speedracer]

yea thats on my list of things to do. that and the 8 million things that need to be fabbed. Im right now trying to buy a TIG welder so I can do my own aluminum. its either that or buy the rest of what I need for this project. I have until march or april anyway.

I answered one of your other post on PWCT,I see you have been asking lots of questions,thats good you are on the right track and Bill certainly has forgotten more about high perf 951's than I will ever know.:headbang:

 

[Brian_216]

Im sure it will be worth it in the end. and asking is the only way to do it right. Id never just have someone else do it for me, I like to be able to work on my own stuff, so knowing things inside out helps when its time to fix it.

 

[WFO Speedracer]

I would mod those rave valves to work off exhaust pressure and just connect the hose from one power valve to the other one,do away with the solenoid alltogether.You could probably find some stiffer springs if you wanted the raves to stay closed longer.

 

[Brian_216]

doing that also, I was going to use a channel in the t4 to activate the solenoid, but thats out. Ill need to ride it first and play with the powervalves and timing once I can get to do some on the water testing. As I see it, I have 5 months before Im comfortable getting in the water anyway. I officialy fired up the furnace today- winter is here.

 

[SXR-FOREVER]

thanks for the pics man

That corrosion is NASTY!

 

[madscientist]

what about building a manual boost controler to activate the valves off the intake system