Displacement vs. Numer of Cylinders
04-12-2008, 05:47 PM
#11
I believe more cylinders gives you more very low end torque. For a race car this is useless. For a street car this makes it feel much more powerful and smooth to your typical driver.
This is the reason BMW did the 3 liter v8 in in the old 530.
This is the reason BMW did the 3 liter v8 in in the old 530.
04-12-2008, 07:01 PM
#12
Registered User
Join Date: Feb 2004
Location: Dry Branch
Posts: 7,087
Likes: 0
Received 0 Likes
on
0 Posts
As much as I enjoy writing long winded posts, this topic is a bit too much. If you're really intereted in learning a little (or a lot) more about engine design, I highly recommend this book. It has a "sufficient" if incomplete discussion of the advantages of various engine configurations.
Keep in mind that a flat 4, V4, I4, flat 6, V6, I6, each have different characteristics, so there is really more involved than merely the number of cylinders. IMO it is better to read up on something this involved than to go out into the world with partial information you picked up on the Internet.
Keep in mind that a flat 4, V4, I4, flat 6, V6, I6, each have different characteristics, so there is really more involved than merely the number of cylinders. IMO it is better to read up on something this involved than to go out into the world with partial information you picked up on the Internet.
04-13-2008, 12:23 AM
#16
Originally Posted by GrandMasterKhan,Apr 12 2008, 02:58 PM
how about that 1.8L v6 offered in the mx3? Tiny displacement with 6 cyl but at what advantage?
04-13-2008, 01:05 AM
#17
Originally Posted by Fastfour,Apr 13 2008, 12:34 AM
I think Audi would disagree.
"The heart of the matter comes down to the incredible 5.5-liter V12 TDI that powers the new chassis. The usual production-type four valves per cylinder are mated to an entirely new aluminum crankcase that pumps out a regulated 650 bhp through a pair of Garrett turbos. Boost pressure is just below the 3-bar measure mark with a useable powerband between 3000 and 5000 rpm. What has set tongues wagging is the unbelievable torque figure of 1100 Nm. While fewer gear changes will be the result of the huge torque, this in no ways reduces the strain on the gearbox."
"The heart of the matter comes down to the incredible 5.5-liter V12 TDI that powers the new chassis. The usual production-type four valves per cylinder are mated to an entirely new aluminum crankcase that pumps out a regulated 650 bhp through a pair of Garrett turbos. Boost pressure is just below the 3-bar measure mark with a useable powerband between 3000 and 5000 rpm. What has set tongues wagging is the unbelievable torque figure of 1100 Nm. While fewer gear changes will be the result of the huge torque, this in no ways reduces the strain on the gearbox."
An interesting case study would be 2.5l F20C vs RB26DETT.
Has anyone swapped a different motor into the S2000? Maybe a boxer 4 cylinder would be interesting.
04-13-2008, 12:41 PM
#19
Registered User
Join Date: Feb 2004
Location: Dry Branch
Posts: 7,087
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Elistan,Apr 13 2008, 09:24 AM
Compare v-twin liter bikes to inline-4 liter bikes.
There is just way more involved than the cylinder count. V twins usually have a relatively long stroke and relatively long connecting rods, so they tend to make gobs of torque, but short stroke twins trade torque at the bottom for power at the top. Then there are V twins with various crank and cylinder angles, flat twins, in-line twins. Even with only two cylinders the overall picture is very complex. Every design decision involves tradeoffs.
04-13-2008, 12:42 PM
#20
Registered User
Join Date: Feb 2004
Location: Dry Branch
Posts: 7,087
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by LlamaS2K,Apr 13 2008, 12:01 AM
Thanks RED MX5, I just ordered the book. 