C8.R packs in flat-plane V8
08-13-2018, 02:45 PM
#41
Race Director
Sounds like a Wankel to me....
I do not think it's a flat plane engine, doesn't sound like it revs high enough.
I do not think it's a flat plane engine, doesn't sound like it revs high enough.
08-13-2018, 03:11 PM
#42
In my humble opinion a FPC is no advantage in toque or HP and may be a disadvantage in weight and balance. The Sound difference is just from the redesigned Hot V exhaust. If you read the info on the Cadillac 4V, 4 cam, 4.2L V8 where the V mounted twin turbos gives them the opportunity to design the exhaust pulses to be Even for each turbo, helping the turbo lag and even out the heat pluses. That will make the exhaust sound just like a FPC engine, from a normal V8 uneven pulses. Also the turbos will quiet the exhaust reducing muffler requirements and temperature. We will learn to love the sound. I want one. Jim
08-13-2018, 08:05 PM
#43
Le Mans Master
Originally Posted by likeaboss
I had three GT350s (long story) but the first one did not have any excessive oil usage while the other two required about a quart between the 5000 mile oil change intervals. What did concern me was the rate of bone stock engines grenading. I do miss the 8250 redline and sweet exchaust note though...
08-13-2018, 08:30 PM
#44
I think the short clip we heard on C8R is much closer to the 488.
08-13-2018, 11:53 PM
#45
Yes it sounds nothing like a V6. It sound lot like European V8. That is the reason I ended up believing it to be FPC as there is no other practical reason for the engine to sound like that.
08-14-2018, 02:15 AM
#46
Lest we forget the best one of them all? The mighty F136 4.5L V8 from the Ferrari 458 Italia. 132.67 HP/L in Speciale guise.
Last edited by ferrmaro; 12-30-2020 at 02:49 AM.
The following users liked this post:
B747VET (08-30-2019)
08-14-2018, 09:21 AM
#47
Instructor
Did say it was, but other owners were more like 1 quart every 1,500 miles or less which is a bit excessive.
Last edited by likeaboss; 08-14-2018 at 09:22 AM.
08-21-2018, 11:00 PM
#48
Race Director
I believe ferraris flat plane crank is 3.9liters in forced induction form is what we could see from the hot vee derived 4.0 twin turbo cadillac form.
i dont think we will see a flat plane crank twin turbo sized above 4.2 liters.
i dont think we will see a flat plane crank twin turbo sized above 4.2 liters.
08-22-2018, 12:34 AM
#49
08-22-2018, 02:48 PM
#51
Le Mans Master
Adding to your point, only two modern FPC V8’s have exceeded 4 liters of displacement. One is obviously the 5.2L Voodoo V8 in the GT350, and the other is a 4.6L V8 in the Porsche 918. According to ZERV, who the forum tends to trust, GM is making a 5.4L V8 and a 4.6L V8 for the C8, and one displacement is likely to have a naturally aspirated variant alongside its turbocharged setup. Unless GM plans on making an engine with the Bore:Stroke ratio of a Ducati Panigale, There’s no way that they’re making a 4.6L or 5.4L FPC V8.
08-22-2018, 02:50 PM
#52
Le Mans Master
08-22-2018, 02:59 PM
#54
With the leaked audio clip C8.R sound in which the engine sounds smooth and deep. It can most-probably be result of Flat-Plane crank. First I thought it was due to implementation of Turbos, but turbos cannot make Corvette Cross-plane V8 sound like that nor can exhaust system. Yes I realize that it is not official but the audio clip of the C8.R sound make it sound more like European V8 and only deduction for it can be inclusion of flat-plane crank instead of cross-plane.
Audio Clip:
https://sportscar365.com/industry/au...-turbo-engine/
Finally Chevrolet decides to drop in Flat-plane V8 in Corvette. Never thought they will drop it in so soon.
Audio Clip:
https://sportscar365.com/industry/au...-turbo-engine/
Finally Chevrolet decides to drop in Flat-plane V8 in Corvette. Never thought they will drop it in so soon.
08-23-2018, 02:30 AM
#55
08-24-2018, 07:03 PM
#57
Le Mans Master
Member Since: Mar 2001
Location: Omaha
Posts: 6,594
Received 2,275 Likes
on
1,193 Posts
2020 Corvette of the Year Finalist (performance mods)
C4 of Year Winner (performance mods) 2019
Doesn't have to be FPC to sound very different from traditional V8. As mentioned above, could be significantly different header/exhaust configuration, could also be DOHC. Personally, I can't wait to see another 7000+ RPM DOHC motor in a Vette. I still think the original LT5 in the C4 ZR-1 is one of the best sounding Vette motors ever, and I love the high rpm power without the huge low end torque.
One of the best C4 ZR-1 sound clips ever:
One of the best C4 ZR-1 sound clips ever:
The following 4 users liked this post by EvanZR1:
08-24-2018, 07:20 PM
#58
Very nice sound from the LT5. 
08-24-2018, 08:07 PM
#59
Why does bhp/liter matter? Bhp/lb helps you go faster...
08-24-2018, 11:49 PM
#60
Doesn't have to be FPC to sound very different from traditional V8. As mentioned above, could be significantly different header/exhaust configuration, could also be DOHC. Personally, I can't wait to see another 7000+ RPM DOHC motor in a Vette. I still think the original LT5 in the C4 ZR-1 is one of the best sounding Vette motors ever, and I love the high rpm power without the huge low end torque.
One of the best C4 ZR-1 sound clips ever:
C4 ZR-1 DOHC
One of the best C4 ZR-1 sound clips ever:
C4 ZR-1 DOHC