convert 454 to 525sc
02-10-2009, 06:11 AM
#11
Registered
Thread Starter
Join Date: Jan 2009
Location: Austria
Posts: 142
Likes: 0
Received 0 Likes
on
0 Posts
HP525SC Specifications
Propshaft Horsepower: 490 (365 kw)
Displacement (Liter/CID): 7.4/454
Cylinders: V-8
Bore (in/mm): 4.25/108
Stroke (in/mm): 4.00/102
Compression Ratio: 7.5:1
Fuel Requirements: 92 Posted Octane (R+M)/2
Full Throttle RPM Range: 4800-5200
Ignition Type: Thunderbolt V
Alternator (amps/watts): 55/776
Length (in/mm): 47.625/1210
Width (in/mm): 32.75/832
Height (in/mm): 28/711
Weight (lbs/kg): 1470/667
They make 525 at the motor and 490 at the prop if running a bravo style drive.
Propshaft Horsepower: 490 (365 kw)
Displacement (Liter/CID): 7.4/454
Cylinders: V-8
Bore (in/mm): 4.25/108
Stroke (in/mm): 4.00/102
Compression Ratio: 7.5:1
Fuel Requirements: 92 Posted Octane (R+M)/2
Full Throttle RPM Range: 4800-5200
Ignition Type: Thunderbolt V
Alternator (amps/watts): 55/776
Length (in/mm): 47.625/1210
Width (in/mm): 32.75/832
Height (in/mm): 28/711
Weight (lbs/kg): 1470/667
They make 525 at the motor and 490 at the prop if running a bravo style drive.
Who did the conversion?
Or where did you buy the parts?
How much did you pay?
Did you chance the prop?
If i am happy with the hull, i should do a transformation with my next reconditioning.
02-10-2009, 06:26 AM
#12
Registered
Join Date: Nov 2001
Location: Pennsylvania
Posts: 3,385
Likes: 0
Received 0 Likes
on
0 Posts
Do you have closed fresh water cooling? It could be an place-issue with the SC.
Who did the conversion?
Or where did you buy the parts?
How much did you pay?
Did you chance the prop?
If i am happy with the hull, i should do a transformation with my next reconditioning.
Who did the conversion?
Or where did you buy the parts?
How much did you pay?
Did you chance the prop?
If i am happy with the hull, i should do a transformation with my next reconditioning.
>My compression is 9.5:1. That is a better fit with this relatively small blower on a bbc
>I did the conversion.
>I bought these as takeoffs from a 525sc from a forum member
>$3300 for almost everything needed
> I went from 28p bravo 1 props to 32p b1s.
02-10-2009, 09:56 AM
#14
Registered
Thread Starter
Join Date: Jan 2009
Location: Austria
Posts: 142
Likes: 0
Received 0 Likes
on
0 Posts
>Yes I run close cooling.
>My compression is 9.5:1. That is a better fit with this relatively small blower on a bbc
>I did the conversion.
>I bought these as takeoffs from a 525sc from a forum member
>$3300 for almost everything needed
> I went from 28p bravo 1 props to 32p b1s.
>My compression is 9.5:1. That is a better fit with this relatively small blower on a bbc
>I did the conversion.
>I bought these as takeoffs from a 525sc from a forum member
>$3300 for almost everything needed
> I went from 28p bravo 1 props to 32p b1s.
that are great news. have you bought used parts or new ones?
can you post a picture? i must see how you mounted the heat exchanger.
Last edited by chris-jack; 02-10-2009 at 01:56 PM.
02-10-2009, 11:57 AM
#15
Registered
Join Date: Nov 2001
Location: Pennsylvania
Posts: 3,385
Likes: 0
Received 0 Likes
on
0 Posts
If you go to boatfreaks.org look in the general discussion area, there are pics of the engines on stands. I am rebuilding them this winter and adding HR cams. Thread is Blue Thunder gets a face lift. I don't have any pics handly of the heat exchanger mounting. That was not part of my 525sc upgrade, these engines were already after market closed cooled. The heat exchangers sit right in front of the engines on a weldment frame bolted to the stringers.
BT
BT
02-10-2009, 12:12 PM
#16
Registered
Platinum Member
I have this entire blower set up as a freshwter take off if you are interested.
Intake, Blower, Belt, Pulleys. $1500 plus shipping. Don't know how many hours it had on it, but it turns over smooth, and feels like it should. I was going to do this also, but my interests have changed.
Intake, Blower, Belt, Pulleys. $1500 plus shipping. Don't know how many hours it had on it, but it turns over smooth, and feels like it should. I was going to do this also, but my interests have changed.
02-10-2009, 01:17 PM
#18
Registered
Thread Starter
Join Date: Jan 2009
Location: Austria
Posts: 142
Likes: 0
Received 0 Likes
on
0 Posts
I have this entire blower set up as a freshwter take off if you are interested.
Intake, Blower, Belt, Pulleys. $1500 plus shipping. Don't know how many hours it had on it, but it turns over smooth, and feels like it should. I was going to do this also, but my interests have changed.
Intake, Blower, Belt, Pulleys. $1500 plus shipping. Don't know how many hours it had on it, but it turns over smooth, and feels like it should. I was going to do this also, but my interests have changed.
Last edited by chris-jack; 02-10-2009 at 01:55 PM.
02-10-2009, 01:47 PM
#19
Registered
Thread Starter
Join Date: Jan 2009
Location: Austria
Posts: 142
Likes: 0
Received 0 Likes
on
0 Posts
If you go to boatfreaks.org look in the general discussion area, there are pics of the engines on stands. I am rebuilding them this winter and adding HR cams. Thread is Blue Thunder gets a face lift. I don't have any pics handly of the heat exchanger mounting. That was not part of my 525sc upgrade, these engines were already after market closed cooled. The heat exchangers sit right in front of the engines on a weldment frame bolted to the stringers.
BT
BT
Last edited by chris-jack; 02-10-2009 at 02:14 PM.
02-10-2009, 02:11 PM
#20
Registered
Platinum Member
