Supercharged 540 Camshaft
12-21-2016, 12:41 PM
#22
Registered
Thread Starter
Join Date: Nov 2016
Posts: 73
Likes: 0
Received 0 Likes
on
0 Posts
My head guy, really likes trick flows heads. Quality , cost ,performance.
My little 468ci engines with 420 B&M blowers, have crower 236/245 114 LSA hyd roller cams. Installed on a 110icl, the intake valve closes at 48*. This past winter, i retarded the cams 4*. Intake valve obviously now closing later.
The static comp is 8:1. The cylinder heads, measured out at 330cc after some throat cut and blend. Twin 850 carbs.
Textbook says these engines should be turds down low.
At loto, night time speed limit is 30mph. I had no issues running on plane at 2700-2800rpm. When cruising along at 3500rpm. And if the drives are nuetral trim or higher, and i stab the throttles, i blow the 17" cleaver props out, and hit the rev limiter.
My little 468ci engines with 420 B&M blowers, have crower 236/245 114 LSA hyd roller cams. Installed on a 110icl, the intake valve closes at 48*. This past winter, i retarded the cams 4*. Intake valve obviously now closing later.
The static comp is 8:1. The cylinder heads, measured out at 330cc after some throat cut and blend. Twin 850 carbs.
Textbook says these engines should be turds down low.
At loto, night time speed limit is 30mph. I had no issues running on plane at 2700-2800rpm. When cruising along at 3500rpm. And if the drives are nuetral trim or higher, and i stab the throttles, i blow the 17" cleaver props out, and hit the rev limiter.
12-21-2016, 12:53 PM
#23
Registered
Thread Starter
Join Date: Nov 2016
Posts: 73
Likes: 0
Received 0 Likes
on
0 Posts
The low RPM makes for a pretty quiet ride, she would probably be happier with low RPM cruise. So if I go with a 651 cam and only shoot for 5500 up top, am I hurting myself. Seems like I may be running to close to max torque. With a blower is it harder on the engine to say, running it at peak torque. I would think we would want about 600 RPM over peak torque, or am I wrong?
12-21-2016, 01:03 PM
#24
Registered
Thread Starter
Join Date: Nov 2016
Posts: 73
Likes: 0
Received 0 Likes
on
0 Posts
Here is why I think the 139671 cam would be a good choice. Let me know what everyone thinks.http://www.superchevy.com/how-to/eng...engine-builds/
12-21-2016, 01:27 PM
#25
Registered
iTrader: (3)
The 671 cam, is pretty much the same cam in the 525efi mercs. In NA form, the 502ci 525EFI engine, seems to run its best around 5300rpm.
Couple things. A roots style blower, bolted on a NA engine that say , made peak hp at 5500, might now make peak hp several hundred rpm higher.
Good flowing heads, will need less duration, than poor flowing heads. A better flowing head, might make peak hp a bit higher than the combo with worse flowing heads, using the same camshaft.
It doesnt sound to me , like you are trying to make big power out of the combo. If you were to go with the 671 cam, you will have a very smooth idling, and docile setup. Even the 651 cam idles like a cream puff in a 540 with roots blower, once you get away from locked timing, and tune the carbs right.
Crane also makes a 240/248 114 cam, that is a nice balance between the 671 and 651 cam. The difference between that cam and the 741 overlap wise, is very small.
They all will work. And , the best part about the crane cams, is they are proven to be easy on parts. Use a quality lifter, the right spring setup, and you should be having fun for a long time on the water.
Couple things. A roots style blower, bolted on a NA engine that say , made peak hp at 5500, might now make peak hp several hundred rpm higher.
Good flowing heads, will need less duration, than poor flowing heads. A better flowing head, might make peak hp a bit higher than the combo with worse flowing heads, using the same camshaft.
It doesnt sound to me , like you are trying to make big power out of the combo. If you were to go with the 671 cam, you will have a very smooth idling, and docile setup. Even the 651 cam idles like a cream puff in a 540 with roots blower, once you get away from locked timing, and tune the carbs right.
Crane also makes a 240/248 114 cam, that is a nice balance between the 671 and 651 cam. The difference between that cam and the 741 overlap wise, is very small.
They all will work. And , the best part about the crane cams, is they are proven to be easy on parts. Use a quality lifter, the right spring setup, and you should be having fun for a long time on the water.
12-21-2016, 01:36 PM
#26
Registered
Thread Starter
Join Date: Nov 2016
Posts: 73
Likes: 0
Received 0 Likes
on
0 Posts
The 671 cam, is pretty much the same cam in the 525efi mercs. In NA form, the 502ci 525EFI engine, seems to run its best around 5300rpm.
Couple things. A roots style blower, bolted on a NA engine that say , made peak hp at 5500, might now make peak hp several hundred rpm higher.
Good flowing heads, will need less duration, than poor flowing heads. A better flowing head, might make peak hp a bit higher than the combo with worse flowing heads, using the same camshaft.
It doesnt sound to me , like you are trying to make big power out of the combo. If you were to go with the 671 cam, you will have a very smooth idling, and docile setup. Even the 651 cam idles like a cream puff in a 540 with roots blower, once you get away from locked timing, and tune the carbs right.
Crane also makes a 240/248 114 cam, that is a nice balance between the 671 and 651 cam. The difference between that cam and the 741 overlap wise, is very small.
They all will work. And , the best part about the crane cams, is they are proven to be easy on parts. Use a quality lifter, the right spring setup, and you should be having fun for a long time on the water.
Couple things. A roots style blower, bolted on a NA engine that say , made peak hp at 5500, might now make peak hp several hundred rpm higher.
Good flowing heads, will need less duration, than poor flowing heads. A better flowing head, might make peak hp a bit higher than the combo with worse flowing heads, using the same camshaft.
It doesnt sound to me , like you are trying to make big power out of the combo. If you were to go with the 671 cam, you will have a very smooth idling, and docile setup. Even the 651 cam idles like a cream puff in a 540 with roots blower, once you get away from locked timing, and tune the carbs right.
Crane also makes a 240/248 114 cam, that is a nice balance between the 671 and 651 cam. The difference between that cam and the 741 overlap wise, is very small.
They all will work. And , the best part about the crane cams, is they are proven to be easy on parts. Use a quality lifter, the right spring setup, and you should be having fun for a long time on the water.
12-21-2016, 06:47 PM
#28
Registered
iTrader: (3)
I have always liked a low RPM cruise. Do you think I am going the wrong direction? Maybe I should shoot for a higher RPM and run a smaller prop. I have to say my wife isn't to happy with my purchase. The low RPM makes for a pretty quiet ride, she would probably be happier with low RPM cruise. So if I go with a 651 cam and only shoot for 5500 up top, am I hurting myself. Seems like I may be running to close to max torque. With a blower is it harder on the engine to say, running it at peak torque. I would think we would want about 600 RPM over peak torque, or am I wrong?
The low RPM makes for a pretty quiet ride, she would probably be happier with low RPM cruise. So if I go with a 651 cam and only shoot for 5500 up top, am I hurting myself. Seems like I may be running to close to max torque. With a blower is it harder on the engine to say, running it at peak torque. I would think we would want about 600 RPM over peak torque, or am I wrong?
12-21-2016, 07:44 PM
#29
Registered
Thread Starter
Join Date: Nov 2016
Posts: 73
Likes: 0
Received 0 Likes
on
0 Posts
Do you think the 651 cam would work as good on the TFS heads. I was thinking I would need less duration on intake than that cam offers? Just trying to learn!
