Advanced Hemi 212cc Predator Build

[bob58o]

As I worked the 320 grit buff to a smaller diameter, I got it to fit deeper inside the port towards the short radius. It was even small enough it get at it from the seat side.

As I worked deeper, I was afraid of the screw holding the buffer on the Dremel mandrel cutting the surface.

I think I'm going to use up these 320's and see from there?

 

[FreeRunner15]

I am actually scared that that the .275 will close to kissing the piston, but I don't know? My last measurement was probably garbage?

I don't know about the bigger camshafts yet but i will be picking up a .310cam tomorrow and post about it and my acquired knowledge of it.
The block and/or crankshaft will need to be ground to fit..i think, i dont know. someone told me the .330 cam he has required a "little" block grinding.

But now that i think about it... i wonder if a higher lift is only a substitute for higher compression kinda like you said about the "amazing thing called compression". i think more duration would be great with big ports so i've been told? where's Danny? DANN-AYY!! i think he would know cams.

I think to open the throat (I'd have to work the short side radius from the port entry), I'd have to lower the flat part of the "D" on the short radius. This would change the angle of the port floor, increase volume, and make the short turn less sharp. (But not sure how much the throat would open? -contain yourself FR lol)

So many things to say here wow lol. Took me a while to clean my mind up.

 

[bob58o]

I don't know about the bigger camshafts yet but i will be picking up a .310cam tomorrow and post about it and my acquired knowledge of it.
The block and/or crankshaft will need to be ground to fit..i think, i dont know. someone told me the .330 cam he has required a "little" block grinding.

But now that i think about it... i wonder if a higher lift is only a substitute for higher compression kinda like you said about the "amazing thing called compression". i think more duration would be great with big ports so i've been told? where's Danny? DANN-AYY!! i think he would know cams.


So many things to say here wow lol. Took me a while to clean my mind up.

Lots of things to consider with large lift cams. P2V clearance, valve train geometry (push rod length), spring coil bind....

If my new camshaft understanding is correct...
Larger lift means more power at all RPM.
Longer Overlap means more potential Upper RPM power.
Longer Overlap means less Lower RPM power.
At high RPM, the engine pumps more air than than it should (scavenging, ramming,...), making up for the loss of compression due to the cam overlap.
At low RPM, the engine doesn't benefit from these things, and reduced compression at low RPM based off of cam overlap is the result.

Large Overlap, More top end, low compression at low RPM.
Small Overlap, More low end, restricted air flow at high RPM


---------- Post added at 01:37 PM ---------- Previous post was at 01:27 PM ----------

I practiced with the pink grinding/sharpening stone on a fin to see how it cut. It seemed too aggressive for what I want? I feel I would have made even deeper cuts that would be hard to get out.

Also apparently Grainger will open the store for you when closed for $50! Not that I would pay that, but cool!

 

[Weekend Warrior]

Just read this whole thread... dude you are a beast! Be exciting to see how much you actually getting out of this motor when you finally stop tinkering lol.

 

[Poboy kartman]

Grainger will open the store for you when closed for $50! Not that I would pay that, but cool!

Poboy will do it for $25!

 

[bob58o]

Just read this whole thread...

I'm sorry

---------- Post added at 02:46 PM ---------- Previous post was at 02:11 PM ----------

So my little compressor will operate this micro die grinder continuously at around 40psi. Not good enough. Not enough torque to keep it spinning in tight spaces. I work for a few seconds, then wait til i get to 100psi and work some more.

So by the time these finishing buffs are the perfect size to get all the way in from the entry side, there is almost nothing left. I have a system now.

Repolish the chamber til it fits in the port, then work up the port as it gets smaller.

I've got one 320 grit left. This is it. After this, I go to hand sanding with wet paper. 220, 500, 1000, 1200 grit is what I have. So it may take some time going from 320 to 500 by hand. You see how long it takes me to go from 120 to 320 with pneumatic grinders (via 180, 280 grit). I probably didn't sprend enough time with the 180, 280 in the tight areas.

After 500, I guess it will be black emery rouge.

My system doesn't help the taper / necking nor does help get a smooth finish close to the bowl, but I'm too far along to go back to reshaping. Besides the locals are getting restless.

---------- Post added at 03:34 PM ---------- Previous post was at 02:46 PM ----------



At least 30 more things to do.

1. Finish Polishing the exhaust. - Clean Head
2. Check P2V clearancem - Clean Head
3. Decide on Gasket Thickness 0.027" or 0.045" (Will use 0.027" if P2V allows)
4. Lapp Valves - Clean Head
5. Install 26lb springs
6. Drain Oil
7. Open and Clean Crank Case
8. Inspect, Clean, Lubricate crank, cam, lifters....
9. Replace Side Cover Gasket with new one, Attach Side Cover, Fill with Oil.
10. Remove Flywheel, Check Flywheel key, Re-Attach Flywheel
11. Set Coil Gap to .030"
12. Seal Head with Head Gasket
13. Attach Carb Adapter with Gaskets
14. Attach studs to Carb Adapter
15. Attach Carb to carb adapter with new gasket
16. Attach Air Filter to Carb
17. Fan Shroud/ Recoil Starter
18. Gas tank
19. Exhaust Pipe- new gasket
20. Throttle Plate
21. Throttle Linkage
21. Set Valve Lash
22. Valve Cover - New Gasket
23. Torque Converter
24. Chain
25. Brakes
26. Jet the Carb
27. Do Wheelies
28. Remove Engine
29. Add Two Engines
30. Do Bigger Wheelies!
...
...
I'm sure I forgot some. Seems like a lot when I type my "To Do" list.

 

[bob58o]

No more 320. Evaluation time.

 

[bob58o]

And

 

[bob58o]

And another. Guess it's on to 500.
But now work. People got to get their Sunday drinking in if so I can afford more projects.

 

[bob58o]

It is less than perfect, but good enough for me!

 

[ezcome-ezgo]

I'm sorry

---------- Post added at 02:46 PM ---------- Previous post was at 02:11 PM ----------

So my little compressor will operate this micro die grinder continuously at around 40psi. Not good enough. Not enough torque to keep it spinning in tight spaces. I work for a few seconds, then wait til i get to 100psi and work some more.

So by the time these finishing buffs are the perfect size to get all the way in from the entry side, there is almost nothing left. I have a system now.

Repolish the chamber til it fits in the port, then work up the port as it gets smaller.

I've got one 320 grit left. This is it. After this, I go to hand sanding with wet paper. 220, 500, 1000, 1200 grit is what I have. So it may take some time going from 320 to 500 by hand. You see how long it takes me to go from 120 to 320 with pneumatic grinders (via 180, 280 grit). I probably didn't sprend enough time with the 180, 280 in the tight areas.

After 500, I guess it will be black emery rouge.

My system doesn't help the taper / necking nor does help get a smooth finish close to the bowl, but I'm too far along to go back to reshaping. Besides the locals are getting restless.

---------- Post added at 03:34 PM ---------- Previous post was at 02:46 PM ----------



At least 30 more things to do.

1. Finish Polishing the exhaust. - Clean Head
2. Check P2V clearancem - Clean Head
3. Decide on Gasket Thickness 0.027" or 0.045" (Will use 0.027" if P2V allows)
4. Lapp Valves - Clean Head
5. Install 26lb springs
6. Drain Oil
7. Open and Clean Crank Case
8. Inspect, Clean, Lubricate crank, cam, lifters....
9. Replace Side Cover Gasket with new one, Attach Side Cover, Fill with Oil.
10. Remove Flywheel, Check Flywheel key, Re-Attach Flywheel
11. Set Coil Gap to .030"
12. Seal Head with Head Gasket
13. Attach Carb Adapter with Gaskets
14. Attach studs to Carb Adapter
15. Attach Carb to carb adapter with new gasket
16. Attach Air Filter to Carb
17. Fan Shroud/ Recoil Starter
18. Gas tank
19. Exhaust Pipe- new gasket
20. Throttle Plate
21. Throttle Linkage
21. Set Valve Lash
22. Valve Cover - New Gasket
23. Torque Converter
24. Chain
25. Brakes
26. Jet the Carb
27. Do Wheelies
28. Remove Engine
29. Add Two Engines
30. Do Bigger Wheelies!
...
...
I'm sure I forgot some. Seems like a lot when I type my "To Do" list.

Or, "How to GAB in 30 easy steps"

 

[bob58o]

Upon further inspection, I'm not happy with the 320 finish. There are cuts left from the coarser grits and I think the base of the abrasive buff (instead of the abrasive) scratched in the tight spaces (when it was small enough to get in there and barely any abrasive left).

I really like this store and the folks that work there.
Eastwood in Chicago
http://www.eastwood.com/chicago
Eastwood has been serving the DIY Auto Enthusiast for over 35 years and is now in Chicago. Curt Strohacker founded Eastwood in 1978, after he had a difficult time finding the tools and supplies needed to restore his 1953 Austin-Healey. A Chicago-native and Northern Illinois University alumni, Curt grew up in Mt. Greenwood, just 2 miles from the new Eastwood Retail Store.

Unlike traditional retail stores, the new Eastwood store incorporates an experiential format, including hands-on usage and interactive training of products. The store features a true shop environment with project vehicles, educational classes and the opportunity to try products before purchase. Whether you are new to the Eastwood family or a longtime customer, Eastwood is committed to helping you “Do The Job Right”. Come visit us!

 

[bob58o]

240 grit, 320 grit abrasive tapers.
Perfect for this job.

At $.85 each, it wouldn't be bad. But they sold em as 10 packs for $8.50. I find THEIR pricing North of HF and eBay, but not by too much and the experience makes it worth it. They like when I bring my head in for show and tell. I like bringing it there. Lol

Grainger only went up to 180 grit.

I'm never going to pull the cord, am I??

 

[Poboy kartman]

Yeah...Eastwood is cool.

BTW: You'll have to change your adress after election day...because Poboy is moving in!

 

[bob58o]

Yeah...Eastwood is cool.

BTW: You'll have to change your adress after election day...because Poboy is moving in!

I call the oval office!

---------- Post added at 02:52 PM ---------- Previous post was at 02:32 PM ----------

Since I'm so invested in these tools and abrasives, maybe I should start garbage picking looking for heads to fix up and sell.

I'm guessing lawnmower Honda GC series are not OHV? I guess I have to look for snow blowers. Honda GX 160.

 

[ezcome-ezgo]

I'm sure there is a tremendous need for ported and polished lawn mower engines.

V

 

[bob58o]

Honda HS522 Snow blower - GX 140
HS55 - GX 140
HS622 - GX 160
HS624 - GX 160

---------- Post added at 03:18 PM ---------- Previous post was at 03:09 PM ----------

I'm sure there is a tremendous need for ported and polished lawn mower engines.

V

^These are SnowBlower models with reduced sized combustion chambers that will fit on any clone... I think???

I'm sure I could sell em....???

Bob's Performance Go Kart Garage

High Compression, Go Kart / Mini Bike Cylinder Heads (Fits Hondas, Clones, and Harbor Freight Predator 212cc), Complete with Race Port & Polish Finish. Increase HP and increase engine Life.

[Insert Pretty Picture Here]

$99


---------- Post added at 03:22 PM ---------- Previous post was at 03:18 PM ----------

Bob has hours of experience Porting and Polishing complemented by Days of On-line Research. All Heads Flow Tested by one means or another!

 

[ezcome-ezgo]

It's simpler than that: GAB $99!

 

[Jrgunn5150]

I really like this store and the folks that work there.
Eastwood in Chicago
http://www.eastwood.com/chicago

I buy alot of thing's from there, most recently, paint for my 73 C10.

 

[chancer]

BTW: You'll have to change your address after election day...because Poboy is moving in!

Finally. I will have the place to myself.

---------- Post added at 04:20 PM ---------- Previous post was at 04:17 PM ----------

It's simpler than that: GAB $99!

Bob! Thats like a dollar and hour!
https://www.youtube.com/watch?v=Qv440W1xS44