Project Motor Swap

[RPM - Robert]

I had hoped to hear from RPM sooner rather than later,...

I have not heard from or seen my dad yet today. I'm sure he'll be here at some point today.

[FJ1200W]

I had hoped to hear from RPM sooner rather than later,...

I have not heard from or seen my dad yet today. I'm sure he'll be here at some point today.

No worries Robert. I appreciate everything you all do!

[FJ1200W]

Randy has an eye for detail and he noticed it appear my pistons were too high.

The deck height is off.

Randy was right. Or was it Robert? Or Noel?

The copper base gasket measured .60mm which is probably not 100% accurate, I'll check again.

I did measure it multiple times, but Cometic only makes them in .020" (.50mm), but the gasket could be from somewhere else.

The piston seems to be approximately .15mm (.005") above the deck.

Should it be even with the deck or below?

If so, can I use a fiber gasket with the copper gasket or do I need to use one gasket of the correct size?

And finally, for this phase, should I spray the copper gaskets with a sealant (Permatex Copper Spray-A-Gasket or )?
I've read you say none, but, well......I had to ask.

Confirmed the current copper base gasket is .020/.50mm and now I have extra button batteries for my digital caliper.

With the ".010" I ordered, the piston should be .005 under - If so, I'll possible order the C8240 .005 to make it as close to perfect as possible, if needed.

Thoughts?

[racerrad8]

... Or Noel?

Thoughts?

I sent an email this afternoon, but I wasn't aware noel was assisting you.

I will step aside and let him be your sole source of technical information.

Randy - RPM

[FJ1200W]

... Or Noel?

Thoughts?

I sent an email this afternoon, but I wasn't aware noel was assisting you.

I will step aside and let him be your sole source of technical information.

Randy - RPM

Note the "winkie"

Please note the "winkie"!

[FJ1200W]

Wanting to "cc" my combustion chamber(s), I needed plugs and found some ancient relics from way back in the last century.

[FJ1200W]

I tried to use a 5cc syringe to measure the chamber volume, and it seemed to be close to 28cc.

Each cylinder should be 328.5cc, divided by 28cc, equals 11.7 to 1

Forgot the head gasket, which should add 5cc(?), and I'm going to install another base gasket lowering the piston a tad, another 2cc (?), that's 7 cc.

28 + 7 = 32. That comes to 10.26cc, which would be fantastic, except for one little detail.

I completely forgot about that piston dome.

Holy cow, these must be some higher compression pistons than I originally thought. The previous owner was running racing fuels, and he did remove the starter and used a gasoline powered devise to spin the rear wheel to get it running.

Originally I assumed he pulled the starter to save weight, a theory others who knew him shared as well. Maybe he pulled it because it was not strong enough for the compression he was running.

So here is where I am at:

100 ml burette is on order. I'm going to measure the volume of the chamber with the engine assembled. I'm considering using 0W-20 engine oil as my fluid, and using a little grease on the top ring to assure it seals.

Once that parameter has been defined, we'll know what needs to be done next. We do have a local gasoline station that has 110 octane race gas, so running that is not out of the question, if needed.

Time will tell......

I want to thank Randy, Robert, RPM and all of you that have helped me through this.  Your help has been invaluable and it is very much appreciated.

[Pat Conlon]

Steve, are you able to shave the piston crown? Randy did that to get my compression down to 10.5-1.
For a street air cooled engine with carbs, that's the max I would go with our Calif. piss water E10 gas.

[FJ1200W]

Steve, are you able to shave the piston crown? Randy did that to get my compression down to 10.5-1.
For a street air cooled engine with carbs, that's the max I would go with our Calif. piss water E10 gas.

I should be able to shave them a bit, if needed.

I'm not planning on this being a daily rider motor, but would like it to be somewhat function for a couple hundred mile day, but most importantly, I really want to break a hundred in the eighth mile on a FJ.

I'm lighter now than I have been in decades, that will help. But I'm going to need a lot more horsepower than I'm currently putting out.

Anyway -

You can still find alcohol free in one of these Cali cities -

Brand
Brawley
Carlsbad
Chico
Cloverdale
Corning
Covelo
Downey
Eureka
Fortuna
Garberville
Grass Valley
Hesperia
Long Beach
Placerville
Redding
Redwood Valley
Riverside
Sacramento
Salton Sea Bch
San Diego
Ukiah
Van Nuys
Weaverville
Westminster
West Sacramento

https://www.pure-gas.org/index.jsp?stateprov=CA

Thanks Pat

[FJ1200W]

Mail came early today -

Hylomar came recommended and what is that in front of the can?

More boxes due tomorrow

[fj1289]

I think you've got enough for that 100 mph in the 1/8th. 

My street bike setup was:
1314 engine, street ported head with drop-in mega cycle cams and flat side carbs.
Front end strapped and rear lowered with longer links and an air shifter


Best run was at Bandimere (5,800' elevation):
60'         1.6670   
330'       4.4890
1/8        6.8910   @  101.94
1/4       10.7950  @  124.67

I think you'll have plenty of power closer to sea level. 

[racerrad8]

... what is that in front of the can?

I know, but I'm not going to spill the beans. I have one as well, just different.

There should be one other member of this forum who has the answer based on his vast experience with the FJ engine.
Although I doubt he'll respond since you have rise to a level where he can't offer you the olive branch...

Randy - RPM

[Old Rider]

Isn't that the good old drb2 that Chrysler used but for bikes ? https://www.youtube.com/watch?v=MXW0bx_Ooq4

[FJ1200W]

I think you've got enough for that 100 mph in the 1/8th. 

My street bike setup was:
1314 engine, street ported head with drop-in mega cycle cams and flat side carbs.
Front end strapped and rear lowered with longer links and an air shifter


Best run was at Bandimere (5,800' elevation):
60'         1.6670   
330'       4.4890
1/8        6.8910   @  101.94
1/4       10.7950  @  124.67

I think you'll have plenty of power closer to sea level. 

Excellent information, thank you!

What gearing did you go with?

[FJ1200W]

... what is that in front of the can?

I know, but I'm not going to spill the beans. I have one as well, just different.

There should be one other member of this forum who has the answer based on his vast experience with the FJ engine.
Although I doubt he'll respond since you have rise to a level where he can't offer you the olive branch...

Randy - RPM

Now where did I put that 10 foot pole.......