Any fresh/lower hour QCV4 1100s for sale?
03-05-2023 | 12:45 PM
#31
Registered
Joined: Jul 2001
Posts: 355
Likes: 43
From: Michigan
IGetWet,
I'm not knocking the QC4V at all, and I wholly agree with the valve train aspect. It's really all about where we want the torque curve to be, and where we want the top end to be. I guess I've answered my own question as to why Merc went with turbos. It's easier to build a production engine at that HP level. But we don't see anybody building custom engines with turbos. Not even for the 50 footers. And those engines are in faster boats.
Thanks. Brad.
(937)545-8991
I'm not knocking the QC4V at all, and I wholly agree with the valve train aspect. It's really all about where we want the torque curve to be, and where we want the top end to be. I guess I've answered my own question as to why Merc went with turbos. It's easier to build a production engine at that HP level. But we don't see anybody building custom engines with turbos. Not even for the 50 footers. And those engines are in faster boats.
Thanks. Brad.
(937)545-8991
It's been awhile now but we built a twin turbo big block and ran it in a 2001 30' Checkmate. By the end of our development of that engine combination we were making almost 1500 ft lbs at 3000 rpms and a peak torque of 1800 ft lbs all on 110 octane fuel. The horsepower was 1730. The boat ran 120 mph and had unbelievable acceleration. Obviously bolting on a blower is a simpler process but unlikely to duplicate these kind of numbers.
03-06-2023 | 06:53 AM
#32
VIP Member
Joined: Jun 2021
Posts: 3,459
Likes: 2,089
From: SW Ohio
It's been awhile now but we built a twin turbo big block and ran it in a 2001 30' Checkmate. By the end of our development of that engine combination we were making almost 1500 ft lbs at 3000 rpms and a peak torque of 1800 ft lbs all on 110 octane fuel. The horsepower was 1730. The boat ran 120 mph and had unbelievable acceleration. Obviously bolting on a blower is a simpler process but unlikely to duplicate these kind of numbers.
Branton's 388 had a couple of quad rotor Whipple motors at 1950HP each. Seems like I remember reading somewhere they were up to 2200HP with them at one point, but I can't find it now. I've seen this boat at Custom Performance in Sumerset, KY a couple times.
Thanks. Brad.
(937)545-8991
03-06-2023 | 09:01 AM
#33
Registered
Joined: Jul 2001
Posts: 355
Likes: 43
From: Michigan
Check,
Branton's 388 had a couple of quad rotor Whipple motors at 1950HP each. Seems like I remember reading somewhere they were up to 2200HP with them at one point, but I can't find it now. I've seen this boat at Custom Performance in Sumerset, KY a couple times.
Thanks. Brad.
(937)545-8991
Branton's 388 had a couple of quad rotor Whipple motors at 1950HP each. Seems like I remember reading somewhere they were up to 2200HP with them at one point, but I can't find it now. I've seen this boat at Custom Performance in Sumerset, KY a couple times.
Thanks. Brad.
(937)545-8991
03-06-2023 | 10:30 AM
#34
Registered
Joined: Aug 2010
Posts: 1,384
Likes: 565
They claim 91 octane.
Second article (updated with new owner) says they went down on blower size and were down to 1800HP.
Key point though is these were ultra exotic Goodwin 650CI marine engines!!
You did your power on less cubes?
https://www.speedonthewater.com/bran...voodoo-skater/
https://www.speedonthewater.com/thor...odwin-engines/
Second article (updated with new owner) says they went down on blower size and were down to 1800HP.
Key point though is these were ultra exotic Goodwin 650CI marine engines!!
You did your power on less cubes?
https://www.speedonthewater.com/bran...voodoo-skater/
https://www.speedonthewater.com/thor...odwin-engines/
03-06-2023 | 11:54 AM
#37
Registered
Joined: Jul 2001
Posts: 355
Likes: 43
From: Michigan
They claim 91 octane.
Second article (updated with new owner) says they went down on blower size and were down to 1800HP.
Key point though is these were ultra exotic Goodwin 650CI marine engines!!
You did your power on less cubes?
https://www.speedonthewater.com/bran...voodoo-skater/
https://www.speedonthewater.com/thor...odwin-engines/
Second article (updated with new owner) says they went down on blower size and were down to 1800HP.
Key point though is these were ultra exotic Goodwin 650CI marine engines!!
You did your power on less cubes?
https://www.speedonthewater.com/bran...voodoo-skater/
https://www.speedonthewater.com/thor...odwin-engines/
We made that power with a tall deck 572.
03-06-2023 | 10:16 PM
#39
Registered
Joined: Aug 2014
Posts: 1,025
Likes: 225
From: Ohio
Check,
Branton's 388 had a couple of quad rotor Whipple motors at 1950HP each. Seems like I remember reading somewhere they were up to 2200HP with them at one point, but I can't find it now. I've seen this boat at Custom Performance in Sumerset, KY a couple times.
Thanks. Brad.
(937)545-8991
Branton's 388 had a couple of quad rotor Whipple motors at 1950HP each. Seems like I remember reading somewhere they were up to 2200HP with them at one point, but I can't find it now. I've seen this boat at Custom Performance in Sumerset, KY a couple times.
Thanks. Brad.
(937)545-8991
03-07-2023 | 06:24 AM
#40
VIP Member
Joined: Jun 2021
Posts: 3,459
Likes: 2,089
From: SW Ohio
Tmmii,
Boost mentioned an interest in seeing somebody strapping a blower on a QC4V, a sentiment I agree with. I mused, wondering why Merc chose turbos over blowers, knowing the answer is ease of engineering and production line assembly. There isn't a single person on this board who wouldn't look at the dyno curves of the Branton engines, for example, and those of a comparable Merc QC4V and, without hesitation, choose the Branton engines. And for likely similar money. And maintenance cycle, for that matter.
It's all good. The OP is looking for QC4Vs. More power to him. I'm not knocking the engines. I just joined a discussion as it was unfolding. This IS a discussion board, right....?
Thanks. Brad.
(937)545-8991
Boost mentioned an interest in seeing somebody strapping a blower on a QC4V, a sentiment I agree with. I mused, wondering why Merc chose turbos over blowers, knowing the answer is ease of engineering and production line assembly. There isn't a single person on this board who wouldn't look at the dyno curves of the Branton engines, for example, and those of a comparable Merc QC4V and, without hesitation, choose the Branton engines. And for likely similar money. And maintenance cycle, for that matter.
It's all good. The OP is looking for QC4Vs. More power to him. I'm not knocking the engines. I just joined a discussion as it was unfolding. This IS a discussion board, right....?
Thanks. Brad.
(937)545-8991
