My 302 Stroker Build

[Florian]

Ahhhhh, now I may have found something:

I obviously didn´t look long enough, the compression rings for the second groove have an inverted bump on them, but no pip mark on the other side. So you they would fit good together with the eight additional rings which have a bump pip mark on them. So that would confirm your assumption that there go two rings in the middle groove, Jamie!

If you assemble the rings now, keeping in mind that the pip mark of the thin ring has to point upwards, then I would guess that the thin ring with the bump goes under the thick compression ring with the inverted bump in the middle groove.

I´ll take some pictures in a second...

[Florian]

Here they are:

You can see one of the eight additional thin rings with the bump on the left, next to one compression ring of the middle groove with the inverted bump.



Here you can see how the two rings line up with the bump of the compression ring in the inverted bump of the other ring. The gaps don´t overlap.




Maybe the 2 in the name tag on the plastic bag stands for the second groove?

What do you guys think?

[Ranchero50]

I think the thick ring with the pip will go in the bottom of the oil ring column. The ring with the divit usually means that side up since some rings are built with a twist so the ring seats better under ignition thrust.

Jamie

[Florian]

Hey Jamie,

I agree with the pip mark pointing upwards, but the thick ring with the negative pip mark was in the part of the box for the second groove, so I can´t imagine why this one should go in the oil groove?

Florian

[Florian]

Jamie, you were right

I got told by the Scat tech department that the additional rings go below the oil ring assembly. Turns out that there should have been instructions inside the box, but there weren´t any in mine...so they´re just trying to e-mail me the instructions

Florian

[Ranchero50]

That's good. Being that far into the engine you want to do stuff correctly.

Jamie

[Florian]

Yeah that´s true.

I did not get the camshaft thrust plate over here...I spent this morning calling every US-parts dealer in Germany.. Now I ordered one on ebay.com

I´ll get the ring expander tool that I ordered tomorrow and will then install the piston rings.

Florian

[Ranchero50]

Have you checked the ring fit in the bores yet? Use the piston top to push the ring down in the bore and seat it square before measuring. Scat should have provided a gap specification.

Jamie

[Florian]

No I haven´t so far, I have got the needed information from Scat though. Also I just got another e-mail from Scat, this time directly from their sales manager, he told me, what his employe forgot to tell me, that the inverted dots on the 2nd groove compression rings are meant to point up. Good thing he told me, I totally forgot about these with all the confusion I had about the spacer rings.

I wanted to measure and assemble the rings today, but I´m having problems with my daily driver loosing coolant and god knows what else I´ll see if I can somehow get the ring expander tool and make it to the shop tomorrow.


What I´m concerned most about right now is the whole pushrod, rocker and rocker geometry thing. I didn´t find the time to really get informed about it though..but the only way to know which pushrods I´m going to need is to measure it when the heads and lifters are installed, isn´t it?

Florian

[Florian]

Quick update: went to get the ring expander tool by bike, 12 miles on icy roads Then installed the rings on 5 pistons, will do the remaining 3 tomorrow. The rings were all already in the tolerance.

Florian

[Hemmi06]

[Florian]

Alright, managed to find some time and installed 2 piston and rod assemblies in the block

Also I searched on the internet where to get a 82° countersink over here in Germany for the cam thrust plate modification..quite impossible it seems..all everybody has is 90°..

Then I reread the notice that came with the timing set, and it says that you only have to use the countersunk bolts when you have a press fit thrust bearing or bronze washer. I don´t know..I haven´t got a thrust bearing or a bronze washer, is there something missing?

Here´s the notice again:




So do I actually need to modify it? Am I missing the thrust bearing or something? I thought the wasn´t anything between the head of the cam and the thrust plate, isn´t it? What´s a thrust bearing then?

Florian

[Ranchero50]

Seams to be a bit of a pain in the arse eh? I would suggest just putting the plate on with hex bolts, the put the top sprocket on and test the fit. The cam should spin free without any axial movement (well, .003-.004").

The 82` is for SAE flatheads, 90` is for metric.

Jamie

[Florian]

Yeah, it really is sometimes over here.. Also the car culture isn´t anything like in the states here in Germany, there are very very few guys who actually turn a wrench themselves and even less who do vintage cars. That´s why you don´t get every tool or part in your local auto store..most auto stores only carry thing like oil, spark plugs and so on, so only real wearing parts. When you need anything special or a special tool like for example a ring expander tool you have to order it or buy it on the internet.

Whatever, I installed the remaining six piston and rod assemblies today and will see how the new thrust plate fits with the hex bolts tomorrow. I ordered a 82° countersink from the states just to be safe

Florian

[Florian]

Damn it...PITA continues..

Turns out my rods were stamped on the wrong sides, I installed them, like my rebuild manual said with the numbers pointing to their cylinder bank. Torqued the rod bolts, crank didn´t move. Found out about the rods being 180° turned and removed all the piston and rod assemblies again. Then I wanted to check the clearance between the new thrust plate and the cam sprocket with the new thrust plate and the hex bolts and broke off one bolt. I didn´t overtighten it, that sucker just broke off Luckily I could remove it..