Swapping pistons
Thread Starter
Launching!
Joined: Sep 2008
Posts: 224
Likes: 47
From: Dayton, OH
Swapping pistons I am looking at a low miles long block at a pretty good price. Rebuilt using an LSA crank, Clevite H series bearings, TSP super H beam rods, Melling pump, ARP Rod bolts, main studs, head studs, etc. PRC Stage 2 823 Heads with LS7 Lifters, LS9 Gaskets and Diamond H013 wrist pins and Diamond 11552 forged pistons, where the concern lies.
They are -12.3 cc pistons, the number I have is 112-TSP6125SHB-8, which results in a 9.4:1 compressions ratio. I want higher, more like 10.5:1 to 11:1. Is it reasonable to swap in similar Diamond pistons? The proposed pistons, 11543-R1-8, are -2.0 cc for a 10.4:1 CR with 70 cc combustion chambers. These heads are 68 cc so the CR will be a bit higher. So much the better. The existing pistons weight 457 grams, the new ones 561 grams, 4 grams more.
Can you pull the rods and pistons out the bottom, swap the pistons, slide them back in a bolt everything back together?
I am looking to get 8 - 900 WHP with a V-2 Ti burning E85.
Thanks!
They are -12.3 cc pistons, the number I have is 112-TSP6125SHB-8, which results in a 9.4:1 compressions ratio. I want higher, more like 10.5:1 to 11:1. Is it reasonable to swap in similar Diamond pistons? The proposed pistons, 11543-R1-8, are -2.0 cc for a 10.4:1 CR with 70 cc combustion chambers. These heads are 68 cc so the CR will be a bit higher. So much the better. The existing pistons weight 457 grams, the new ones 561 grams, 4 grams more.
Can you pull the rods and pistons out the bottom, swap the pistons, slide them back in a bolt everything back together?
I am looking to get 8 - 900 WHP with a V-2 Ti burning E85.
Thanks!
Last edited by SteveJewels; Jul 13, 2021 at 06:59 PM.
I am looking at a low miles long block at a pretty good price. Rebuilt using an LSA crank, Clevite H series bearings, TSP super H beam rods, Melling pump, ARP Rod bolts, main studs, head studs, etc. PRC Stage 2 823 Heads with LS7 Lifters, LS9 Gaskets and Diamond H013 wrist pins and Diamond 11552 forged pistons, where the concern lies.
They are -12.3 cc pistons, the number I have is 112-TSP6125SHB-8, which results in a 9.4:1 compressions ratio. I want higher, more like 10.5:1 to 11:1. Is it reasonable to swap in similar Diamond pistons? The proposed pistons, 11543-R1-8, are -2.0 cc for a 10.4:1 CR with 70 cc combustion chambers. These heads are 68 cc so the CR will be a bit higher. So much the better. The existing pistons weight 457 grams, the new ones 561 grams, 4 grams more.
Can you pull the rods and pistons out the bottom, swap the pistons, slide them back in a bolt everything back together?
I am looking to get 8 - 900 WHP with a V-2 Ti burning E85.
Thanks!
They are -12.3 cc pistons, the number I have is 112-TSP6125SHB-8, which results in a 9.4:1 compressions ratio. I want higher, more like 10.5:1 to 11:1. Is it reasonable to swap in similar Diamond pistons? The proposed pistons, 11543-R1-8, are -2.0 cc for a 10.4:1 CR with 70 cc combustion chambers. These heads are 68 cc so the CR will be a bit higher. So much the better. The existing pistons weight 457 grams, the new ones 561 grams, 4 grams more.
Can you pull the rods and pistons out the bottom, swap the pistons, slide them back in a bolt everything back together?
I am looking to get 8 - 900 WHP with a V-2 Ti burning E85.
Thanks!
Now, the 9.4:1 compression will give a larger tuning window under boost, than the 10.4 your looking to do. The 10.4:1 will be fine, don’t get me wrong, and work well, but it’s a lot of money and work for a compression point climb, in a boosted application. Just my opinion, of course.
