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 Post subject: Piston Choice
PostPosted: Wed Mar 15, 2017 11:15 am 
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Joined: Sat Jun 16, 2007 10:31 pm
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Location: Brisbane, QLD
Just wondering if anyone has recommendations for a particular brand of piston?
It's going to be nice ~1330 7-porter so it might see a few revs but doesn't have to worry about boost, etc.

So far all I can find are Hypatecs or GR's own and both seem to have good reviews?

Cheers,
Sam


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 Post subject: Re: Piston Choice
PostPosted: Wed Mar 15, 2017 8:04 pm 
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1275cc
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Hypatecs mate, great qualitity and great value for money, sub $200 with rings on ebay.

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 Post subject: Re: Piston Choice
PostPosted: Thu Mar 16, 2017 10:23 am 
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Both are good. I have used both.
Hypatecs come with Hastings imperial width (USA) rings.
GR's are a bit lighter, have the rings positioned a little higher, and come with Nippon metric width rings.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank @7000+, 45 Dellorto, RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. Going harder with Stealth Black Box in.:mrgreen:

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 Post subject: Re: Piston Choice
PostPosted: Thu Mar 16, 2017 2:25 pm 
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i have a set of 1360 GR pistons sitting in the shed. They are marked "STD". Are these pistons from another type of car?

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 Post subject: Re: Piston Choice
PostPosted: Thu Mar 16, 2017 5:14 pm 
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Hi TK
No they are not from another engine the 73mm pistons are marked STD and the 73.5 are marked .020 this was decided when I designed the pistons for precision, so I marked mine the same way so there was no confusion, but they did not want to run their rings that close to the top of the piston as their ring could not cope with the heat.
So after being burnt by precision I decided to go it alone using a different manufacture to make my pistons, mine are lighter, better quality ring package, I have a flat dish with a much bigger squish band for better combustion.
Also my plus .040 and .060 1275 pistons have drilled holes behind the oil ring not a slot like the precision which is a weak point for high RPM,go and have a look at my website at the testing we did for my sons car running the motor way above 8500 RPM with out any problems.
I have pistons here where the pistons have broken through the slot they were hypatec.
But in saying that I have used hypatec in a lot of engines and in the right application they are an excellent piston, as for price I can not even think about trying to match their price as there buying power is massive compared to mine, so all I can offer is a very good quality piston at a reasonable price.
Graham russell

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 Post subject: Re: Piston Choice
PostPosted: Mon Mar 20, 2017 9:47 pm 
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Good to know this about Hypertec pistons. A search of Hypertecs show that some have several small holes behind the oil ring and others have slots. Something to remember if buying them.

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 Post subject: Re: Piston Choice
PostPosted: Wed May 31, 2017 7:45 pm 
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848cc
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Got some Hypatec ones. The pistons seem of good quality.


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 Post subject: Re: Piston Choice
PostPosted: Wed May 31, 2017 9:39 pm 
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GR wrote:
Hi TK
No they are not from another engine the 73mm pistons are marked STD and the 73.5 are marked .020 this was decided when I designed the pistons for precision, so I marked mine the same way so there was no confusion, but they did not want to run their rings that close to the top of the piston as their ring could not cope with the heat.
So after being burnt by precision I decided to go it alone using a different manufacture to make my pistons, mine are lighter, better quality ring package, I have a flat dish with a much bigger squish band for better combustion.
Also my plus .040 and .060 1275 pistons have drilled holes behind the oil ring not a slot like the precision which is a weak point for high RPM,go and have a look at my website at the testing we did for my sons car running the motor way above 8500 RPM with out any problems.
I have pistons here where the pistons have broken through the slot they were hypatec.
But in saying that I have used hypatec in a lot of engines and in the right application they are an excellent piston, as for price I can not even think about trying to match their price as there buying power is massive compared to mine, so all I can offer is a very good quality piston at a reasonable price.
Graham russell


Whew :!: thanks GR, here is me thinking it stood for Subject To Detonation :!: :lol:

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 Post subject: Re: Piston Choice
PostPosted: Wed May 31, 2017 10:22 pm 
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TK wrote:
Good to know this about Hypertec pistons. A search of Hypertecs show that some have several small holes behind the oil ring and others have slots. Something to remember if buying them.

Hypatec 1330s (+.060") and smaller have a short drain slot.
The bigger Hypatecs 73.0, 73.5, 74.0 have drilled holes.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank @7000+, 45 Dellorto, RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. Going harder with Stealth Black Box in.:mrgreen:

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 Post subject: Re: Piston Choice
PostPosted: Thu Jun 01, 2017 6:21 pm 
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Joined: Wed Jan 19, 2005 1:52 pm
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Location: Brisbane
My 040 Hypertecs have holes and not slots. Unless the selling company put another brand of piston in a Hypertec box. Hmmm? Possible and more than likely.

Anyway, the 73mm 1360 pistons also suit Mazda TC 1.3 L E1300, 323 808 G33B engines as well as Mitsubishi and Hyundi.

ACL ring set part number is PS1589
Hastings is chrome rings are 2C4347, non chrome is 4347.

Cheaper to buy pistons and rings for a Mazda. ;)

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 Post subject: Re: Piston Choice
PostPosted: Fri Jun 02, 2017 8:51 am 
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Are the gudgeon pins same size on a Mazda?

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank @7000+, 45 Dellorto, RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. Going harder with Stealth Black Box in.:mrgreen:

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 Post subject: Re: Piston Choice
PostPosted: Fri Jun 02, 2017 12:21 pm 
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Looks like it Kev. They are marked STD too.

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 Post subject: Re: Piston Choice
PostPosted: Fri Jun 02, 2017 12:37 pm 
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A little off topic, but I had a Mazda 323 with a UC engine (1400cc) and a TC head.

UC has the same stroke but 76mm bore, a little too large for a mini..
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 Post subject: Re: Piston Choice
PostPosted: Fri Jun 02, 2017 4:08 pm 
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that might fit in a mini!?!

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 Post subject: Re: Piston Choice
PostPosted: Fri Jun 02, 2017 6:55 pm 
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Joined: Fri Jun 19, 2009 5:31 pm
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Location: North Rocks
Hi TK
The mazda piston that you talk about are 73mm but that' where it stops,the compression height for the Mazda is1.456 the mini is 1.528 some .072 down the bore the gudgeon pin is smaller in dia so you have to get the rods bushed, and they are a flat top piston.
Now if you want to go to all that trouble why would you not go and get some of the motor cycle pistons which are much lighter than all the car pistons, but once again a lot of work to get them to fit so why not go an buy a set of my or precion pistons that fit straight in when bored :)
Graham Russell

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