RootesRacer
Donation Time
Not entirely on "stock" topic, but does anyone know where to get new 1600/1725 iron head hillman pistons?
.020 over if anyone has them on hand.
.020 over if anyone has them on hand.
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Hillman parts source?
- Thread starter RootesRacer
- Start date
You might try Speedy Spares in the UK.
RootesRacer
Donation Time
I'd have thought that too, but they only showed aluminum head pistons,
Anyone else?
Someone has to support the old hillmans dont they?
RootesRacer
Donation Time
Yeah, been looking there too.
Found several sets over the last few months but for some reason the folks in England refuse to ship anything off their island.
Keeping it to themselves I reckon.
RootesRacer
Donation Time
That'd be great.
What I need are a set of 1592/1725 flat top pistons for a .020 over bore (3.230).
Thx
RootesRooter
Donation Time
What are the differences between pistons used on cast iron vs. aluminum head engines?
RootesRacer
Donation Time
Iron head engines have larger combustion chamber volumes and flat top pistons, the alloy head engines have smaller chambers and dished pistons.
Relies from the Hillman list
I've never had the head of my Hillman, so I have no idea if these guys are right or wrong. Regardless, no sources. Here goes.
"I have a set of std 1494 pistons,rings,pins flat tops but the later ones were all dished unless Sunbeam used flat tops."
"My original Hepolite book does not show flattops for these--"
"i used a set of mk11 zephyr pistons, flat top, plus .020" gave a 1725cc
engine 1820cc, compression height was lower by .040""
"The Holbay 1725 engine used flat-top pistons, std 1725 are dished."
"AE offered flat top pistons for 1592 and 1725 in their catalogs in the
1970s and early 80s, but BAP-GEON never could get them for me. As far as I
know, REPCO never had them available."
I've never had the head of my Hillman, so I have no idea if these guys are right or wrong. Regardless, no sources. Here goes.
"I have a set of std 1494 pistons,rings,pins flat tops but the later ones were all dished unless Sunbeam used flat tops."
"My original Hepolite book does not show flattops for these--"
"i used a set of mk11 zephyr pistons, flat top, plus .020" gave a 1725cc
engine 1820cc, compression height was lower by .040""
"The Holbay 1725 engine used flat-top pistons, std 1725 are dished."
"AE offered flat top pistons for 1592 and 1725 in their catalogs in the
1970s and early 80s, but BAP-GEON never could get them for me. As far as I
know, REPCO never had them available."
RootesRacer
Donation Time
1) does it have the same compression height at the 1725?
2) by 1500 I assume you are talking about the 5 main 1498 (not to be confused with 1494)?
3) What is the application (and CR of that engine)?
4) Where does one purchase those pistons?
I dont think any hunter 1500 engines were used on any US imported cars.
Thx for this info.
RootesRacer
Donation Time
65beam
Donation Time
pistons
try - www.speedyspares.co.uk . they have lots of parts listed . i call them and place my orders and shipment is fast to the U.S.
try - www.speedyspares.co.uk . they have lots of parts listed . i call them and place my orders and shipment is fast to the U.S.
alpine_64
Donation Time
Jarrid,
Give me the specs of the pistonsby sunday your time.. and ill call them Monday. Im sure they will have the,, i got my flat tops from JP and they ha d a large range.. try looking under sunbeam or rootes aswell.. either way. guve me specs and ill chase it up.
Jarrid
The 1500 (actual 1496) was an early 5 mains cast Iron headed Hunter engine. It had a shorter throw crank with longer rods than the 1725. The claimed combustion chamber volume was 50.18 cc and a 8.4:1 compression ratio. Service pistons were +.020 and Speedy spares have them listed on their website under Hunter Part No 75121874 The pistons will have a Triangle or HC stamped onto the top face for ID.
Pete
The 1500 (actual 1496) was an early 5 mains cast Iron headed Hunter engine. It had a shorter throw crank with longer rods than the 1725. The claimed combustion chamber volume was 50.18 cc and a 8.4:1 compression ratio. Service pistons were +.020 and Speedy spares have them listed on their website under Hunter Part No 75121874 The pistons will have a Triangle or HC stamped onto the top face for ID.
Pete
RootesRacer
Donation Time
Thx for this info.
Does the HC 1500 hunter use the same compression height as the 9.2/1 1725 piston? Also is it a full flat top?
Jarrid
The Piston is a true Flat top and dimensionally identical to the 1725 piston. I don't have data for the Compression height, but wouldn't that be governed by the particular cam being used. (I'm not really sure I understand what is meant by the term).
They are quite a heavy piston and the remanufactured route may be the best way for a fast engine. Holbay reduced the overall length by some 0.5 inch for their engine and although I don't know the actual weight they feel considerably lighter in comparison.
Pete
The Piston is a true Flat top and dimensionally identical to the 1725 piston. I don't have data for the Compression height, but wouldn't that be governed by the particular cam being used. (I'm not really sure I understand what is meant by the term).
They are quite a heavy piston and the remanufactured route may be the best way for a fast engine. Holbay reduced the overall length by some 0.5 inch for their engine and although I don't know the actual weight they feel considerably lighter in comparison.
Pete
Jim E
Donation Time
Jarrid,
I used a set of the 1500 hunter iron head pistons in my 1725, compression hieght is the same they just have flat tops and they also have the second oil ring. Guess you could chuck them up and turn the bottom off if you can find a set. Found them on ebay UK but it took some digging to turn them up, all in with shipping might have been $100.
I used a set of the 1500 hunter iron head pistons in my 1725, compression hieght is the same they just have flat tops and they also have the second oil ring. Guess you could chuck them up and turn the bottom off if you can find a set. Found them on ebay UK but it took some digging to turn them up, all in with shipping might have been $100.