Hi all
Just after some good or bad feedback on ACL pistons for 253 (8MKRY9119)
ACL said 6500 RPM would be about it. I have been looking for something to go over 7 but nothing with out going stroker bits and bobs.
61 replies to this topic
#1
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Posted 27 December 2011 - 10:00 PM
#2
TerrA LX
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Posted 28 December 2011 - 12:38 AM
I reckon they will live over 7k every now and then so long as you don't lean on them too hard.
May I ask why you would want to turn a lil fluffee so hard tho?
May I ask why you would want to turn a lil fluffee so hard tho?
#3
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Posted 28 December 2011 - 05:06 AM
To geat 400 + HP out of the lil fluffee.
#6
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Posted 28 December 2011 - 06:31 PM
they will be fine up to 7k. detonation is what will kill them.keep the tune good and they will be fine.
#7
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Posted 28 December 2011 - 07:39 PM
Who makes forgies for 253 ?
We have bigger motor but the $10 bet is gold
We have bigger motor but the $10 bet is gold
#8
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Posted 28 December 2011 - 08:00 PM
253 piston is same as something else
Very similar to 186 ... different pin diam and deck height... but all fixable
Though I would say Commodore cup boys know where to get forgies
Very similar to 186 ... different pin diam and deck height... but all fixable
Though I would say Commodore cup boys know where to get forgies
#9
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Posted 28 December 2011 - 08:35 PM
Commodore cut run ACL but they run out of rev at 61/2
The best fit I could find was Hemi 245. Ream the pin out. Deck height is a bit higher which is good. Bore is 3.76 but they bore them to fit 305 chev in stroker kit. But I would like to keep the weght down and stick with standar size + 30”
The best fit I could find was Hemi 245. Ream the pin out. Deck height is a bit higher which is good. Bore is 3.76 but they bore them to fit 305 chev in stroker kit. But I would like to keep the weght down and stick with standar size + 30”
#10
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Posted 28 December 2011 - 09:25 PM
The rev range has nothing to do with the piston though
Its cams , heads and manifolds that govern it
Especially in that class of racing
Its cams , heads and manifolds that govern it
Especially in that class of racing
#11
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Posted 28 December 2011 - 10:01 PM
i'm not sure..but have heard of guys using chev 305 pistons in 253..but you have to use a chev rod..i think
try Presicion International for pistons
try Presicion International for pistons
#12
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Posted 28 December 2011 - 10:02 PM
Yes you are right. Commodore cup apprantly have quite a small cam and stop making power long befor 61/2.
I was after lighter pistons so it puts less strain at higher rev. The little 3.6 inch bore should be quite a bit lighter I thought.
As I was hopping to run VN rod with arp bolt. The ACL piston are 487g. I have probe in a 355 at 489g
I was after lighter pistons so it puts less strain at higher rev. The little 3.6 inch bore should be quite a bit lighter I thought.
As I was hopping to run VN rod with arp bolt. The ACL piston are 487g. I have probe in a 355 at 489g
#13
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Posted 28 December 2011 - 10:26 PM
Thank you, yes presicion have piston (PHO2538) only $280 proberly cast but I will ring check out the wight
Yes 305 use SJ chev rod I think
Yes 305 use SJ chev rod I think
#14
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Posted 29 December 2011 - 11:02 PM
if you were able to use the chev 305 piston and rod..that would give you heaps of options like a lighter rod and a lighter forged piston?
but you would have to do a good balance job
but you would have to do a good balance job
#15
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Posted 30 December 2011 - 09:58 AM
If you are going lighter than standard then it would be a piece of piss to balance.
Set of 305's with SJ rods and enough comp for the cam would see ya 400hp IMO.
Set of 305's with SJ rods and enough comp for the cam would see ya 400hp IMO.
Edited by TerrA LX, 30 December 2011 - 09:59 AM.
#16
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Posted 30 December 2011 - 04:36 PM
u wont get enough comp with 305 pistons as they have the valve reliefs in them. problem with 245 hemi pistons is there is only 6 in a set. nothing wrong with acl.
#17
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Posted 30 December 2011 - 08:10 PM
u wont get enough comp with 305 pistons as they have the valve reliefs in them.
What's the maximum comp you have gotten out of one?
#18
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Posted 30 December 2011 - 09:54 PM
Two thing here for me. One was to use up as many parts that we already have, so didn’t want to go chev parts. But good pistons we have a lack of.
Two the comp is not a issue as we are using VN head. They have 64cc chambers so we will have to skim about a 1.5mm off them to get back to about 48cc and skim the block to zero deck hight.
Two the comp is not a issue as we are using VN head. They have 64cc chambers so we will have to skim about a 1.5mm off them to get back to about 48cc and skim the block to zero deck hight.
#19
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Posted 31 December 2011 - 09:00 AM
with my old 253..i had 1.94x 1.60 valves an red heads..they notched the bores for the inlet valves and used 308 head gaskets it was 20 thou over
what valves are in the vn heads? are you gunna have the same issues.. as that would hurt the comp?
if you are gunna zero deck it and shave a bit off the heads wont you have piston to valve clearance problems..especially with a big cam?
what valves are in the vn heads? are you gunna have the same issues.. as that would hurt the comp?
if you are gunna zero deck it and shave a bit off the heads wont you have piston to valve clearance problems..especially with a big cam?
Edited by lxssv8, 31 December 2011 - 09:04 AM.
#20
TerrA LX
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Posted 31 December 2011 - 09:09 AM
Hell it won't be easy otherwise there would have been 100's of 400hp 253's running around 30years ago.
#21
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Posted 31 December 2011 - 09:33 AM
true Terra..very true..just say'n the OP is going to have to carefully pick parts for this combo!
#22
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Posted 31 December 2011 - 03:14 PM
im using the hi top acl and with 49cc head i should of ended up with 12:1 but had to fly cut pistons a bit so ended up with bout 11.5:1.What's the maximum comp you have gotten out of one?
#23
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Posted 31 December 2011 - 06:08 PM
Two thing here for me. One was to use up as many parts that we already have, so didn’t want to go chev parts. But good pistons we have a lack of.
Two the comp is not a issue as we are using VN head. They have 64cc chambers so we will have to skim about a 1.5mm off them to get back to about 48cc and skim the block to zero deck hight.
That's a fair call wanting to use what you have. Chev pistons and rods are cheap and if you use the small journel rods, it means the crank needs a bit of a grind. It also means the crank could be offset ground, which could alter the engine capacity and deck height, both of which will alter your compression ratio without having to touch the heads.
#24
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Posted 31 December 2011 - 08:11 PM
OK this is were it strated.
We have a 355 VN heads crane 288 cam and so on we made 500HP. I said if all this is in a smaller motor (253) and you spen it harder you can make near the same power in theory. Reply, Bull sh--, so its on for a $10 bet.
Goal is to make a cost effective 253. But the bench mark is 400 HP.
We have 3 or 5 253 in the shed 3 sets of VN heads, VN rods, Crane 288 cam for VN heads and bits and bobs from other projects.
I am not a big lover of the 253 but I think its strenth is in it smaller piston. By keeping the wieght down you should be able to spin it harder with out spending a forchoon.
If we stroke it it wouldnt be a 253 and may as well just use a 308.
We have started on the heads. One of the motors has ACL race piston, but I would like something stronger ? Maybe throw it together and see what happens. If it gose bang start again ?
The two problems we are up against is piston and cam. I have sent JE pistons a email to check out our options. The other is not shore if the 288 cam is sutable for a 253. So I have also sent email for recomenasion.
Some gasgets and bearing might be all we need. Sounds like a smashing time. But don’t lose track of the big pitcher ($10 bet).
We have a 355 VN heads crane 288 cam and so on we made 500HP. I said if all this is in a smaller motor (253) and you spen it harder you can make near the same power in theory. Reply, Bull sh--, so its on for a $10 bet.
Goal is to make a cost effective 253. But the bench mark is 400 HP.
We have 3 or 5 253 in the shed 3 sets of VN heads, VN rods, Crane 288 cam for VN heads and bits and bobs from other projects.
I am not a big lover of the 253 but I think its strenth is in it smaller piston. By keeping the wieght down you should be able to spin it harder with out spending a forchoon.
If we stroke it it wouldnt be a 253 and may as well just use a 308.
We have started on the heads. One of the motors has ACL race piston, but I would like something stronger ? Maybe throw it together and see what happens. If it gose bang start again ?
The two problems we are up against is piston and cam. I have sent JE pistons a email to check out our options. The other is not shore if the 288 cam is sutable for a 253. So I have also sent email for recomenasion.
Some gasgets and bearing might be all we need. Sounds like a smashing time. But don’t lose track of the big pitcher ($10 bet).
#25
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Posted 01 January 2012 - 06:05 AM
If your 355 is making 1.408 HP/CID then I think you will be at least 32CID short of your 400hp target, I will have $10 as well.
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