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Old 05-05-2019, 04:13 PM
 
Location: Brawndo-Thirst-Mutilator-Nation
22,579 posts, read 24,400,027 times
Reputation: 20222

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If you don't want to drive a stick, do not get a car with a tiny engine or your driving experience
will suffer.
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Old 05-05-2019, 04:35 PM
 
Location: By the sea, by the sea, by the beautiful sea
68,281 posts, read 54,065,692 times
Reputation: 40571
Quote:
Originally Posted by EckyX View Post
A 1.5L 3 cylinder will fire every 120 degrees, while a 1.5L 4 cylinder will fire every 90 degrees, yes. NVH is lower on the 4 cylinder. However, both can fire a piston with the same relative crank angle.
Most I-4 cranks I've ever seen have their throws 180 deg apart so they fire 180 apart but an I-4 with that configuration has perfect primary balance.

Last edited by burdell; 05-05-2019 at 04:47 PM..
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Old 05-05-2019, 05:44 PM
 
17,487 posts, read 17,349,511 times
Reputation: 25473
I’m curious how a modern turbo 3 cylinder engine would work in the old Honda CRX?
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Old 05-05-2019, 05:52 PM
 
Location: Vermont
1,002 posts, read 902,921 times
Reputation: 2046
Quote:
Originally Posted by victimofGM View Post
I’m curious how a modern turbo 3 cylinder engine would work in the old Honda CRX?
Problem with putting modern mills in a CRX is that the hood is really low in that car. Newer engine bays tend to be less long but taller. Most modern engines I've fantasy-fit into the CRX end up with either oil pans hanging 2 inches above the road, or with a cut-out in the hood.

Now, the 2000 Insight on the other hand...

It's 2-300lbs lighter than the 2nd gen CRX and has a similar layout - large hatch, two seats, low and wide, good handling. I weighed mine with the hybrid battery out, and it came out to an astounding 1650lbs. It also has a roomy engine bay which comfortably fits most modern engines. I'm actually in the process of swapping a Honda K24A2 into mine, which undoubtedly will hurt economy a bit but should give it a little extra oomph.

My progress so far:




Not mine, but someone else who has done the same swap:

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Old 05-05-2019, 06:22 PM
 
17,487 posts, read 17,349,511 times
Reputation: 25473
Quote:
Originally Posted by EckyX View Post
Problem with putting modern mills in a CRX is that the hood is really low in that car. Newer engine bays tend to be less long but taller. Most modern engines I've fantasy-fit into the CRX end up with either oil pans hanging 2 inches above the road, or with a cut-out in the hood.

Now, the 2000 Insight on the other hand...

It's 2-300lbs lighter than the 2nd gen CRX and has a similar layout - large hatch, two seats, low and wide, good handling. I weighed mine with the hybrid battery out, and it came out to an astounding 1650lbs. It also has a roomy engine bay which comfortably fits most modern engines. I'm actually in the process of swapping a Honda K24A2 into mine, which undoubtedly will hurt economy a bit but should give it a little extra oomph.

My progress so far:




Not mine, but someone else who has done the same swap:
Blasphemy! You’re trying to turn a slow hybrid into a gas guzzling sleeper! “Good for yoouuu!” (South Park Smug Alet reference)
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Old 05-05-2019, 06:45 PM
 
Location: Vermont
1,002 posts, read 902,921 times
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Quote:
Originally Posted by victimofGM View Post
Blasphemy! You’re trying to turn a slow hybrid into a gas guzzling sleeper! “Good for yoouuu!” (South Park Smug Alet reference)
Oh, but it shouldn't be too bad afterward.

I'm digressing, but I've had a completely custom gearset made which will allow highway cruising at less than 1500rpm. I've also reduced the rotating mass in the engine extensively, and cut parasitic losses. I expect to still be able to get 50-60mpg highway and around 4 seconds to 60 - should be ballpark 250HP.
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Old 05-05-2019, 07:54 PM
 
Location: Myrtle Creek, Oregon
15,293 posts, read 17,584,595 times
Reputation: 25225
Quote:
Originally Posted by HappyRider View Post
Three cylinders just sound WRONG!
I have a Kubota 3-cylinder diesel on my utility tractor. It's a solid engine.
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Old 05-05-2019, 09:18 PM
 
Location: Montgomery County, PA
16,568 posts, read 15,139,225 times
Reputation: 14589
Quote:
Originally Posted by Larry Caldwell View Post
I have a Kubota 3-cylinder diesel on my utility tractor. It's a solid engine.
I wasn't thinking of farm equipment. My push mower has a 1 cylinder engine and it's doing fine.
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Old 05-06-2019, 06:01 AM
 
Location: Flahrida
6,280 posts, read 4,789,775 times
Reputation: 7415
I had a SAAB back in the early 60's with a 3 Cylinder 2 stroke engine that had a lifetime replacement warranty. It really flew for a little engine and was really quiet and smooth.

https://jalopnik.com/engine-of-the-d...linder-5363118
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Old 05-06-2019, 02:57 PM
 
10,581 posts, read 5,560,361 times
Reputation: 18846
Quote:
Originally Posted by HappyRider View Post
Three cylinders just sound WRONG!
I had a Kawasaki 500 two-stroke-cycle engine with 3 cylinders. The Mach III. It sounded wonderful, and accelerated like crazy, especially after I cranked through the math to design my own expansion chambers designed to maximize power over a narrowed 1500 rpm power band leading up to redline. https://en.wikipedia.org/wiki/Kawasaki_H1_Mach_III
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