convert 454 to 525sc
#31
Charter Member # 55
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IMO, the 177 is maxed out on 454 and a 250 is maxed out on a 502.
Higher compression pistons will allow you to spin them slower and make less boost, so they can work an larger ci engines. Its just not the preferred method.
In the end, a supercharger forces more air in and raises the effective compression ratio. If you start spinning the smaller SC's too fast, they will just make more heat and increase the risk of detonation.
Higher compression pistons will allow you to spin them slower and make less boost, so they can work an larger ci engines. Its just not the preferred method.
In the end, a supercharger forces more air in and raises the effective compression ratio. If you start spinning the smaller SC's too fast, they will just make more heat and increase the risk of detonation.
#32
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i think i will do the conversions 454 - 525sc when freshing up the engines maybe this year. anyone knows a company to sell all the stuff i need and gives good support. i always have a lot of questions and not all companies like this.
#33
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I would like to know more:
I have a 95 454mag and looking to do the same thing.
I have a complete take off coming but am a little nervous about the final compression.
525sc w/5.5lbs boost and 7.5:1 compression is at 10.31 final.
Mine w/5.5lbs boost and 8.6:1 compression is at 11.83 final.
That is like running 8.5 lbs of boost on the 7.5:1 engine, minus the extra blower heat.
Now given I am running the stock Iron heads, is it going to detonate?
I don't really have the $$ to spend on a cooler, maybe I can go with methanol injection
for an extra level of safety.
Or do I need to find a big enough pulley to drop it below 4lbs of boost.
(4lbs will be at 10.94:1 final)
What are your thoughts on this?
I have a 95 454mag and looking to do the same thing.
I have a complete take off coming but am a little nervous about the final compression.
525sc w/5.5lbs boost and 7.5:1 compression is at 10.31 final.
Mine w/5.5lbs boost and 8.6:1 compression is at 11.83 final.
That is like running 8.5 lbs of boost on the 7.5:1 engine, minus the extra blower heat.
Now given I am running the stock Iron heads, is it going to detonate?
I don't really have the $$ to spend on a cooler, maybe I can go with methanol injection
for an extra level of safety.
Or do I need to find a big enough pulley to drop it below 4lbs of boost.
(4lbs will be at 10.94:1 final)
What are your thoughts on this?
#34
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Location: Pennsylvania
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I would like to know more:
I have a 95 454mag and looking to do the same thing.
I have a complete take off coming but am a little nervous about the final compression.
525sc w/5.5lbs boost and 7.5:1 compression is at 10.31 final.
Mine w/5.5lbs boost and 8.6:1 compression is at 11.83 final.
That is like running 8.5 lbs of boost on the 7.5:1 engine, minus the extra blower heat.
Now given I am running the stock Iron heads, is it going to detonate?
I don't really have the $$ to spend on a cooler, maybe I can go with methanol injection
for an extra level of safety.
Or do I need to find a big enough pulley to drop it below 4lbs of boost.
(4lbs will be at 10.94:1 final)
What are your thoughts on this?
I have a 95 454mag and looking to do the same thing.
I have a complete take off coming but am a little nervous about the final compression.
525sc w/5.5lbs boost and 7.5:1 compression is at 10.31 final.
Mine w/5.5lbs boost and 8.6:1 compression is at 11.83 final.
That is like running 8.5 lbs of boost on the 7.5:1 engine, minus the extra blower heat.
Now given I am running the stock Iron heads, is it going to detonate?
I don't really have the $$ to spend on a cooler, maybe I can go with methanol injection
for an extra level of safety.
Or do I need to find a big enough pulley to drop it below 4lbs of boost.
(4lbs will be at 10.94:1 final)
What are your thoughts on this?
Last edited by blue thunder; 02-25-2009 at 12:01 PM.
#35
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I have been there, done that with the 454 to 525sc conversion, and it workded out great. I started with a 454 mag., installed forged aluminum pistons with a compression ratio of 8.25/1, installed edelbrock marine rect. port heads with good valves and roller rocker arms, a crane hydraulic roller 731 cam and lifters and crane roller rockers. I then installed a weiand 177 with superchiller intercooler and custom built boost referenced 4150 style carb.
I have run this for a season(probably 60 hrs) and it is rock solid. It sound like huge power, even though it isn't, and does a great job of delivering a reliable 600+ HP.
I unfortuneately got the speed bug and am finishing up a 609ci motor that will be in the 900+ range.
we pulled the 525 out this last weekend. the only parts I am re-using are the headers, distributor, and msd ignition. I would prefer to sell the motor complete, but might separate the induction package(carb, intercooler, blower, intake), heads, and then short block.
pm me or call me if you want to talk about it 405-850-0515
sam
I have run this for a season(probably 60 hrs) and it is rock solid. It sound like huge power, even though it isn't, and does a great job of delivering a reliable 600+ HP.
I unfortuneately got the speed bug and am finishing up a 609ci motor that will be in the 900+ range.
we pulled the 525 out this last weekend. the only parts I am re-using are the headers, distributor, and msd ignition. I would prefer to sell the motor complete, but might separate the induction package(carb, intercooler, blower, intake), heads, and then short block.
pm me or call me if you want to talk about it 405-850-0515
sam
#36
Charter Member # 55
Charter Member
I would like to know more:
I have a 95 454mag and looking to do the same thing.
I have a complete take off coming but am a little nervous about the final compression.
525sc w/5.5lbs boost and 7.5:1 compression is at 10.31 final.
Mine w/5.5lbs boost and 8.6:1 compression is at 11.83 final.
That is like running 8.5 lbs of boost on the 7.5:1 engine, minus the extra blower heat.
Now given I am running the stock Iron heads, is it going to detonate?
I don't really have the $$ to spend on a cooler, maybe I can go with methanol injection
for an extra level of safety.
Or do I need to find a big enough pulley to drop it below 4lbs of boost.
(4lbs will be at 10.94:1 final)
What are your thoughts on this?
I have a 95 454mag and looking to do the same thing.
I have a complete take off coming but am a little nervous about the final compression.
525sc w/5.5lbs boost and 7.5:1 compression is at 10.31 final.
Mine w/5.5lbs boost and 8.6:1 compression is at 11.83 final.
That is like running 8.5 lbs of boost on the 7.5:1 engine, minus the extra blower heat.
Now given I am running the stock Iron heads, is it going to detonate?
I don't really have the $$ to spend on a cooler, maybe I can go with methanol injection
for an extra level of safety.
Or do I need to find a big enough pulley to drop it below 4lbs of boost.
(4lbs will be at 10.94:1 final)
What are your thoughts on this?
#37
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I have been there, done that with the 454 to 525sc conversion, and it workded out great. I started with a 454 mag., installed forged aluminum pistons with a compression ratio of 8.25/1, installed edelbrock marine rect. port heads with good valves and roller rocker arms, a crane hydraulic roller 731 cam and lifters and crane roller rockers. I then installed a weiand 177 with superchiller intercooler and custom built boost referenced 4150 style carb.
I have run this for a season(probably 60 hrs) and it is rock solid. It sound like huge power, even though it isn't, and does a great job of delivering a reliable 600+ HP.
I unfortuneately got the speed bug and am finishing up a 609ci motor that will be in the 900+ range.
we pulled the 525 out this last weekend. the only parts I am re-using are the headers, distributor, and msd ignition. I would prefer to sell the motor complete, but might separate the induction package(carb, intercooler, blower, intake), heads, and then short block.
pm me or call me if you want to talk about it 405-850-0515
sam
I have run this for a season(probably 60 hrs) and it is rock solid. It sound like huge power, even though it isn't, and does a great job of delivering a reliable 600+ HP.
I unfortuneately got the speed bug and am finishing up a 609ci motor that will be in the 900+ range.
we pulled the 525 out this last weekend. the only parts I am re-using are the headers, distributor, and msd ignition. I would prefer to sell the motor complete, but might separate the induction package(carb, intercooler, blower, intake), heads, and then short block.
pm me or call me if you want to talk about it 405-850-0515
sam
#38
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Edelbrock Oval RPM marine heads, 525sc blower with factory Dominator, 525SC cam, 8.5:1 comp, 500 EFI headers. Pretty good power for a super mild combo..
#39
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#40
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Tyler Crockett put together a sweet package for me. I went the whole enchilada with Brodix heads. Never on dyno, but a sweet package perfect idle and lots of power.