Scored a 26-27 engine today,guy said it had been in barn 40 years,said it was a running engine when put in barn,wonder how these heads compare to the Z's
Maybe a rookie question, why the sparkplug where the mag connection would be? Is that a possible substitute? Or was it just to fill the hole when the mag was shot?
Probably just a way to fill the hole. I like that little foot feed!
Randy, you will love that head, hard to come by and never have head gasket issues cast to cast!
Selling the head?
If Seth is right and that spark plug is just a hole filler does that suggest the magneto is either absent of wasn't functioning?
With the exhaust manifold end open like that I can just about gaurantee that mice have peed inside and rusted the valve stems to the guides. Don.
No sell it going on my 27 touring I am bulding engine for,Thanks Joe was going with a Z until I came across this.
Great find, a cool and useful accessory
Since it was made back in the days of kerosene infested gas they couldn't raise the compression ratio as much as we can today, so you may expect less improvement than with a modern Z or Prus head, but it's likely still better than many other available modern improvements like a high volume intake.
The Giant Power head was very similar in the combustion chamber design to the Haibe Hipower and the Simmons Super Power - and from this photo you can also tell they were an inspiration for the Z head of today:
The Tulsa Model T club has measured heads and made a comparison of compression ratios of a range heads they could find some 10 years ago:
Today's Z heads may have a larger combustion chamber, since the one I've measured had 220 cc, or 5:1 compression ratio. The Giant head would be similar to the Haibe in the table, with 4.3:1 - the improvement doesn't only lie the difference from std 3.8:1 - it's the improved shape with a squish area over the piston that concentrates the air/gas mix near the spark plug and improves efficiency.
A spark plug is not too different from the magneto post. It does the same job of isolating the post but without the pressure and heat requirements.
I have often used spark plugs as a great way of isolating an electrical entry to a high pressure vessel as in a interface detector in a oil / water separator.
In militaryspeak, that was:
The use of SP's is a preferable mode of IEE to HPV as ID/OWS's.
Please, make a note of it.
From this and a couple other posts, I see you're on fire this morning! How many cups of coffee? Please translate IEE to HPV as ID/OWS's. I get SP's, the rest is beyond my scope. I will make a note of it!
Not stupid, just slow this morning! (one cup of coffee) compared apples to oranges and realized: isolating an electrical entry to a high pressure vessel as in a interface detector in a oil / water separator. DUH!
YOICKS!! Do you have to remove the ground electrode to prevent a SNAFU?
Nice find. Made under Haibe patent. I have a Haibe, Giant power, and Simmons Super Power Heads . This is the first I have seen( Giant super power).Photo of combustion chamber Please.
here you go Dean
Looks just like the Simmons head in Dean's photos above. Maybe you can put a plug in one of the plug holes, level it on a bench and fill with water with some nice measuring cups you may find in the kitchen for baking and medicine, to see if it differed much from the 15.6 cubic inches the Tulsa club got for the Haibe head? (Though I'd suppose they're similar)
If you want it to be more like a Z in performance you may shave it 0.050" or maybe even 0.100" - check how much meat there is to shave from in the holes and test fit it without any gasket, with modeling clay on the pistons to check clearance for the pistons. Good luck