Can anyone explain why ARP head studs for 1hd-t so expensive???
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Can anyone explain why ARP head studs for 1hd-t so expensive???
Can anyone explain why ARP head studs for 1hd-t so expensive???
Is there any particular part we should order do they can fit?FYI, we are now having FTE heads machined under the cam for the head bolt seats. We are taking off 2mm since the ARPs don't clear under the cam, rather than modify the studs we just remove a little off the seats. This is only an issue for studs under the cam.
Cheers
Can you please explain what Pre-topped pistons means? Are the piston tops machined down to lower comp ratio?I can partly answer this question as I have been stocking and re-selling the ARP head studs for the 1HZ and 1HDT for a while now, and have recently started with the studs for the 1HD-FT and 1HD-FTE (also sold as the Yanmar 6LPA which is based on the 1HD-FT engine). I have a hard time keeping these in stock as I can only get small numbers in, and then they sell almost immediately.
The exclusive rights to these studs is owned by one of the main engine parts suppliers in Australia, Engine Australia. These studs are somewhat more expensive than for other diesel engines, but not by a huge amount. This is most likely related to the limited production runs and the cost of commissioning the development of a new product, and then of course shipping and importation costs.
The studs are ARP 2000 material and are made in (small) production runs based on demand. The demand for these kits has been higher than expected, and then there has been supply chain issues (as with everything these days) and then also losses of inventory due to the catastrophic flooding in Australia. The flooding has not affected the price, but it did wipe out a whole shipment of head studs at the start of this year.
The studs are available in two configurations: the 11mm drop in head stud kits and the 1/2" machine fit kits where the block is drilled and tapped for 1/2" threading and the head bolt holes in the head are opened up to fit the larger diameter stud.
The 11mm head studs offer about 40% improved clamping force when compared to the stock TTY head bolts when using the torque procedure supplied with the studs. The stock torque method is not used, and should not be used as it is specific to TTY bolts.
The ARP studs can be re-used. This is a big advantage if you're taking your head off from time to time.
The 1/2" ARP 2000 head studs are less costly than the 11mm versions, but the downside is that the the block and head need to be machined. The upside is that these are stronger than the 11mm versions and if you're looking for the ultimate in preventing head lift because you're running high boost numbers - like in the mid 40 PSI range - then these are the ones for you on your next engine build.
The Engine Australia part numbers are:
11mm drop in fit - 1HZ 1HD-T = HSKTO340A
11 mm drop in fit for - 1HD-FT, 1HD-FTE, Yanmar 6LPA = HSKTO30A
1/2" machine in fit - 1HZ 1HD-T = HSKTO340
1/2" machine in fit - 1HD-FT, 1HD-FTE, Yanmar 6LPA = HSKTO360
Note that ARP does not sell these to the retail public or to wholesale business customers, they are exclusive to Engine Australia. You can get them from busineses such as mine (located in Canada) or others that are located in Australia or New Zealand.
I am adding to my performance parts listings slowly and steadily as there are requests for these items to be stocked. I have recently brought in a few sets of the ACL Race Series main bearings to compliment the ACL Race Series con rod bearings that have become increasingly popular - the Main Bearings will appear on my new eCom site soon.
For those looking for more performance, I am also waiting for stock to arrive for the new 4340 I-Beam Billet Connecting Rods which are replacing the now discontinued H-Beam Connecting Rods for the 1Hx series of engines. I should be seeing stock of these at some point in late June or early July 2022. Pre-orders will be accepted soon, stock is fairly limited. These pair nicely with the pre-topped ceramic coated pistons...
~John
Can you please explain what Pre-topped pistons means? Are the piston tops machined down to lower comp ratio?
Thanks
Gotcha. That's what I was wondering. How much are they topped? Getting ready to tear an engine down and measure everything soon.It's to lower piston height to accommodate block machine work. But will also lower compression
Gotcha. That's what I was wondering. How much are they topped? Getting ready to tear an engine down and measure everything soon.
Is there any particular part we should order do they can fit?
Does that mean all HSKTO30A have to be ground down a bit?
Sorry, I don’t login to to ‘Mud very often as business and life is far too busy for me.Can you please explain what Pre-topped pistons means? Are the piston tops machined down to lower comp ratio?
Thanks