Build 1965 Seminole Red FJ45 SWB

[FJ60Cam]

The pin moved a little more than 1/2” closer to the top of the piston. Here’s a good visual:

Even being longer, the new rods are 235g (1/2 lb) lighter than an average weight stock rod. The range is all over the place from all the years of 2Fs, from the 940s up to the 1030s, tho not that big of a spread from the same motor.

The pistons are 269g (.59 lbs) lighter than stock

 

[FJ60Cam]

Checking the fit of the rings, most of them are around .013 for the top, and .018, which is right in the middle of the factory spec.

We aren’t using the Toyota spec, however. We will calculate these based on the bore, which gives .017 & .021 as the minimum gap. Too big is better than too small here.

 

[spazzyfry123]

I think my favorite part of these builds is seeing all the collaboration between different Mud members. Great stuff guys.

 

[deliverance]

This is good stuff… will final compression be the same?

 

[Gordobe]

That’s exciting to see modern machining being installed in 50+ year old technology

besides alloy pistons that I used, I went stupid and ordered Carrillo rods that totaled 16 pounds lighter then factory

look forward to hearing you engine purrrrrrr

 

[FJ60Cam]

Pistons, rods, bearings assembled before fitting the rings.

I always weigh the pistons and rods separately and mix and match to get the weights close, and then remove material from the rods to match the lightest rod/piston combo. I did the same here, and 5 out of 6 came out to 1285, and one a gram less.

If these were factory cast rods, I’d remove a gram each from the 5, but these are too nice to do that for a one gram difference.

 

[FJ60Cam]

On to the rings…

Rings for factory type builds usually work straight from the package, I usually only have to do this on the custom builds. I use a simple ring grinder to gently file them down:

Then knock down and polish the edges of the cut with a sanding sponge:

Check the fit, and repeat the above as necessary…

Eons later…

 

[FJ60Cam]

Rings on, time to go in…

When you’re tired of fawkin around with the universal ring compressors, you get appropriate sized one piece:

Caps on…

Profit:

 

[middlecalf]

This brings back memories at Ramco Piston Ring. I didn’t do any motor building but it was “fun” watching the techs do it. Then they would attempt to blow the motor up to get another test data point .

 

[White Stripe]

I hate filing rings. It takes forever. I've had to file oil control rings too on some motors because they were too tight. This engine will be nice. With the lighter rotating assembly I imagine you can rev it pretty high.

 

[FJ60Cam]

To be continued…

 

[GTV]

Thing of beauty.

What is the factory rod length and the length of the new Carrillos?
Those pistons make me think stroker.

 

[wngrog]

Then they would attempt to blow the motor up to get another test data point .

That’s my job. PawPaw Lockwood won’t ever take it past 3500

 

[Dekeman]

Like jewelry! Will torque be about the same?

 

[Crinkler]

Just read this whole thread, love your truck and work you guys are doin

 

[jomelo]

Just read this whole thread, love your truck and work you guys are doin

Thank you. Good stuff happening in the next few weeks.

 

[FJ60Cam]

Thing of beauty.

What is the factory rod length and the length of the new Carrillos?
Those pistons make me think stroker.

These are about a 1/2” longer, center to center.

Like jewelry! Will torque be about the same?

Thanks! No idea what to expect, it will be interesting to see what happens!

This is good stuff… will final compression be the same?

It will be higher. I’ll do that in the next post.

Here’s a rough compression calculation of a stock 2F. It’s hard to nail down an exact number because head gasket thicknesses vary a little and the combustion chamber volumes vary a little, but this makes the 7.8:1 CR work:

…and here’s the stock 3F/3FE, which is a little higher. It has a shorter stroke and smaller combustion chamber which give it a 300cc smaller displacement.

 

[FJ60Cam]

To calculate the final, we broke out the science lab and went full Mr. Wizard:

Final volume:

Plugging these into the calculator gives a 9.2:1 CR, up from the 7.8 original

 

[FJ60Cam]

Cam installed:

Oil pump in:

Oil pan on (w/stickers soaking):

 

[FJ60Cam]