G226 vs H226

[JSeery]

Ok, I know very little to nothing about the Ford L6 cylinder engines. The G & H both have the same cylinder diameter and the same stroke. What is the difference in the pistons? Is it the design of the crown? Just curious.

[Bob C]

I was wondering also. The green book says the G has dome pistons and
the H has flat top.

Bob

[mercman from oz]

The “G” series engine was still very Ford-like. The “H” series engine was almost a copy of a Plymouth, Pontiac, or Studebaker six. If you can, refer, for example, to pages 210-213 in the “Green Bible” (Chassis Parts and Accessories Catalogue, Passenger Cars 1928 thru 1948 and Trucks 1928 thru 1947).
Both were L-Head engines and both used timing gears rather than the timing chain used on the Plymouth and Pontiac sixes.
“G” Series
Distributor on front of engine
Oil pump on front main bearing cap like V-8 60 and 9N tractor
Mushroom-foot valves
Split valve guides retained by horse shoe clip
“H” Series
Distributor on side of engine
Oil pump on right side of engine below exhaust manifold
Valves with split keepers
Pressed-in valve guides

Specifications
“G” Series
Bore: 3.3
Stroke: 4.4
Displacement: 226.0
Compression Ratio: 6.70
Brake Horsepower: 90@3300

“H” Series
Bore: 3.3
Stroke: 4.4
Displacement: 226.0
Compression Ratio: 6.80
Brake Horsepower: 95@3300

[JSeery]

Mercman, that is sorta my question. The pistons appear to be similar enough to be interchangeable. So was interested in what feature on the piston makes them different. I could see domed vs flat topped. A flat top should work in place of an original domed piston except for the compression ratio issue.

Guess there could be a difference in the deck height between the two blocks.

Just went back and looked at edhd58 photos of the pistons that came out of his engine and I can't tell if they were flat top or not. He had stated that the builder had stated that he had used H pistons. If that is correct, I would think it could be done again.

[edhd58]

JSeery, The paperwork says the kit, from EGGE was an H 226 kit, but the pistons are domed. I didnt see the paperwork until I picked up the motor. He didnt know what the difference was either, so we went with it. I don't know for a fact The H factor had anything to do with my current problems I am just wanting to use what is specifically made for that motor to avoid future issues if the difference is the issue.

Now here is an interesting fact, the 9N Ford Tractor piston is the same bore and compression height, but made different. The 9N Ford also has a lot lower compression.

The original pistons that came out of my motor were domed 4 ring pistons, and they were two different pistons, the skirts were relieved different. This last set were 3 ring domes pistons.


This however is getting away from your question. Just what is the actual difference between the H and G pistons?

[flatheadmurre]

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You can´t just change domeshape of the pistons and compression in an engine and keep the ignition settings...
This would be like sticking early flat top pistons in a -37 and keep the better ignition curve of the 11a...would´t work very well.
Not only the compression but also the shape of the combustion chamber affects the timing of the ignition.
You can mix and match parts but then you need to be willing to experiment to get it right.

[Bob C]

Originally Posted by edhd58

JSeery, The paperwork says the kit, from EGGE was an H 226 kit, but the pistons are domed. I didnt see the paperwork until I picked up the motor. He didnt know what the difference was either, so we went with it. I don't know for a fact The H factor had anything to do with my current problems I am just wanting to use what is specifically made for that motor to avoid future issues if the difference is the issue.

Now here is an interesting fact, the 9N Ford Tractor piston is the same bore and compression height, but made different. The 9N Ford also has a lot lower compression.

The original pistons that came out of my motor were domed 4 ring pistons, and they were two different pistons, the skirts were relieved different. This last set were 3 ring domes pistons.


This however is getting away from your question. Just what is the actual difference between the H and G pistons?

According to the Ford factory manuals I have the 9N bore is 3.187 and
the 226 is 3.3.

Bob

[40 Deluxe]

[QUOTE=edhd58;1613927]

Now here is an interesting fact, the 9N Ford Tractor piston is the same bore and compression height, but made different. The 9N Ford also has a lot lower compression?

No, the 9N (as well as the 2N and 8N) pistons are identical to the 3 3/16" bore 239 cu. in. flathead V8.

[edhd58]

Oops. I must have seen that 3 in the 3/16 and not read the rest.

[edhd58]

https://www.ebay.com/itm/RARE-SET-6-...72.m2749.l2649

I just couldn't pass this up. especially after flattheadmure's statement about what all is affected by changing piston shape.
The ones I am purchasing have the lower ring like the ones that were in there when I bought the car.

[40 Deluxe]

Originally Posted by edhd58

https://www.ebay.com/itm/RARE-SET-6-...72.m2749.l2649

I just couldn't pass this up. especially after flattheadmure's statement about what all is affected by changing piston shape.
The ones I am purchasing have the lower ring like the ones that were in there when I bought the car.

Just be sure to use a modern three-piece oil ring and leave that bottom groove empty! No need for the extra friction.

[edhd58]

40 Deluxe, just asking, why would i not use it the way it is designed to be used? wouldn't no ring also allow extra piston movement?

[JSeery]

The lower ring has nothing to do with piston movement, the rings "float" on the piston. Modern rings are far superior to the older rings and the forth ring was not originally used. It was added because of oil usage issues with the poorer quality ring setup.

[tubman]

Old style one-piece oil rungs needed all the help they could get; modern 3-piece rings do not. Only leave the bottom ring off if you have 3-piece oil rings or don't mind a little oil consumption.

[edhd58]

Thanks guys. I still have to buy rings. Figure I'll through Hastings.

[edhd58]

Well guys if Barnfind has some I'll get those if not looks like H pistons for the G. I just can't find any G pistons +0.060

[flatheadmurre]

Did you give Falcon Global a call ?
They still have rebuild kits for the G motor listed.

[amodel25]

Check with Kanter Auto Parts. They list G engine parts in their catalog. I rebuilt my H about 15 years ago and got all my engine parts from them. All American parts in old stock boxes. No Chinese junk!

[edhd58]

Just heard from Falcon Global. They won't have these pistons until September. Barnfind08 doesn't have them. I going examine the H piston and if they are the same except for the not dome top they're there.

[Bob C]

As mentioned above Kanter shows them. https://www.kanter.com/productdetail...Router=Gallery

Bob