Mythbuster: continuing project thread of my 1303 '75

[paul_f]

Hi Wally, is the water tank for water injection?

[Wally]

Yes, actually it has 50% methanol content.

[volkdent]

Hey Wally, I've got 100% methanol right now, any reason I should or shouldn't be running 50/50 mix?

Jason

[Wally]

Originally Posted by volkdent

Hey Wally, I've got 100% methanol right now, any reason I should or shouldn't be running 50/50 mix?

Jason

Yes, lots of reasons not to use 100% meth.
Too much, too long explanantion with many arguments on the practicle and performance side to the why of that, sorry.
I've have come to the conclusion 50/50 is best.
YMMV

[volkdent]

Originally Posted by Wally

Yes, lots of reasons not to use 100% meth.
Too much, too long explanantion with many arguments on the practicle and performance side to the why of that, sorry.
I've have come to the conclusion 50/50 is best.
YMMV

Certainly half as expensive! Thanks, I'll use distilled water then?

Jason

[brookester]

...plus 100% is flammable.

[Wally]

Originally Posted by volkdent

Certainly half as expensive! Thanks, I'll use distilled water then?

Jason

Yes, definately! Regular water contains salts which will block your jet(s) openings after a while.
The (non-visible) flammable part is one of the many reasons not to use 100% or even 75% meth iirc. At 50/50 is non-flammabe anymore as well. Not sure where exactly the border is, but its a moot point.

[Wally]

Last week I took the engine apart as I wanted to have the case machined for a different cooling system (more of that later when its all worked out) and another cam to try out.

Good thing I did as all bearings and heads, pistons, cylinders were still in tip-top shape, but the rods were surely not!


One has had a movement is 2 directions, but two others were just bend one way Before discussions start if this was the limit of stock rods: NO, its not; this was all caused by boost-cuts of the ecu causing huge back fires that even snapped two rockers if you can remember



Fortunately Jake still had a set of slightly used Pauters, so those are underway

[Clatter]

Does this mean that you got another set of 1.7-1.8 spec rods?
Or are you going to be getting a crank upgrade?

I look at those "stock" rods,
ANd there sure was a lot of nice work put into them.
Nice trophies for sure!

[Wally]

Originally Posted by Clatter

Does this mean that you got another set of 1.7-1.8 spec rods?

Not yet, but these are underway

Or are you going to be getting a crank upgrade?

The nice thing about the 74mm stroker I still have is that its got the same big end journal as the 1.7/1.8 ltr 66mm crank
The problem is the cylinders had to be cut back very short so its doubtfull 8mm more stroke is seen as still safe for how far the pistons will come out then...
But I am sure you know what would have my vote

I look at those "stock" rods,
ANd there sure was a lot of nice work put into them.
Nice trophies for sure!

You got that right: LOTS of work went into them

[Xellex]

wow, I can't believe the rods bent so bad, that it's very visible in the pictures.. and still nothing failed.

[Bradey Bunch]

Is the crank still straight?

Braden

[Wally]

Originally Posted by Bradey Bunch

Is the crank still straight?

Braden

Don't know yet as I haven't got the sort of equipment to measure that myself, but crankshaft is spotless and must be straight as all main and bearings were super nice as well:

[NO_H2O]

Wow. Looks like you caught those just in time. They are wall hangers for sure.

[hotsauce]

That coulda been messy! Good thing you tore it down!