Clear up 1.8L and 2.0L Beta differences
08-05-2002, 03:34 PM
#31
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Just some more food for thought.
The 1.8L uses domed/peaked pistions. the 2L uses essentially flat pistions.
using the 2.0L pistions in the 1.8L motor gives you a 1.8L motor with 9.3:1 Compression Ratio.
using 1.8L pistions in a 2.0L motor gives you an 11.5:1 Compression ratio.
"dished" pistions from UFB that give a 8.2:1 CR in the 2.0L motor, would give 7.1:1 CR in the 1.8L.
So...for my Hybrid/Bastard 1.8L...I can use "stock" shaped 2.0L pistions and have "low" compression for boost, without having to resort to dishing the pistion.
The 1.8L uses domed/peaked pistions. the 2L uses essentially flat pistions.
using the 2.0L pistions in the 1.8L motor gives you a 1.8L motor with 9.3:1 Compression Ratio.
using 1.8L pistions in a 2.0L motor gives you an 11.5:1 Compression ratio.
"dished" pistions from UFB that give a 8.2:1 CR in the 2.0L motor, would give 7.1:1 CR in the 1.8L.
So...for my Hybrid/Bastard 1.8L...I can use "stock" shaped 2.0L pistions and have "low" compression for boost, without having to resort to dishing the pistion.
08-06-2002, 05:49 AM
#32
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I'm just about to order the RPW racing cams. But after reading your posts which state that the cams in the 1.8l engine is better than in the 2.0l, I am having second thoughts. How much more lift will it provide and how many horsepower gains and torque can I expect? Is it worth it for me to order the RPW cams?
P/s: I have a 1.8l Hyundai Coupe
P/s: I have a 1.8l Hyundai Coupe
08-15-2002, 12:17 AM
#34
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<div class='quotetop'>QUOTE</div><div class='quotemain'>Random:
Just some more food for thought.
The 1.8L uses domed/peaked pistions. the 2L uses essentially flat pistions.
using the 2.0L pistions in the 1.8L motor gives you a 1.8L motor with 9.3:1 Compression Ratio.
using 1.8L pistions in a 2.0L motor gives you an 11.5:1 Compression ratio.
"dished" pistions from UFB that give a 8.2:1 CR in the 2.0L motor, would give 7.1:1 CR in the 1.8L.
So...for my Hybrid/******* 1.8L...I can use "stock" shaped 2.0L pistions and have "low" compression for boost, without having to resort to dishing the pistion. </div>You could, but wouldn't material of the piston inself still be a down fall? and a reliability issue? specially in a high boost situation.
now a 1.8L is best for hgih rev applications. but I think Key motorsports has stated they have never had a BETA run at 8000rpms for longer then 20mins before it died.
I am assuming for a boost application the 1.8L and 2.0L are pretty much on the same level. Thou I suppose the short stroke has something to do with spooling up faster? Cause of a quicker rev.
Just some more food for thought.
The 1.8L uses domed/peaked pistions. the 2L uses essentially flat pistions.
using the 2.0L pistions in the 1.8L motor gives you a 1.8L motor with 9.3:1 Compression Ratio.
using 1.8L pistions in a 2.0L motor gives you an 11.5:1 Compression ratio.
"dished" pistions from UFB that give a 8.2:1 CR in the 2.0L motor, would give 7.1:1 CR in the 1.8L.
So...for my Hybrid/******* 1.8L...I can use "stock" shaped 2.0L pistions and have "low" compression for boost, without having to resort to dishing the pistion.
</div>You could, but wouldn't material of the piston inself still be a down fall? and a reliability issue? specially in a high boost situation.now a 1.8L is best for hgih rev applications. but I think Key motorsports has stated they have never had a BETA run at 8000rpms for longer then 20mins before it died.
I am assuming for a boost application the 1.8L and 2.0L are pretty much on the same level. Thou I suppose the short stroke has something to do with spooling up faster? Cause of a quicker rev.
08-15-2002, 12:39 AM
#35
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No, the 1.8L and 2.0L will not rev the same because of the shorter stroke and longer rods. This combination makes the sidewall loading of the cylinders go down significantly, which leads to a LOT less stress on the rings, piston skirts, sleeves and rod bearings.
Which, in turn, could allow the 1.8L version a higher redline than the 2.0L version.
Not a lot of people have tried this as I understand, but likely for good reason. The folks in Korea are taxed (HUGE taxes) by engine displacement, and it goes on 0.5L increments: 1.5L, then 2.0L, then 2.5L, etc. This is why the 1.8L motors aren't widely used there -- if you're gonna be taxed for 1.8L, you might as well go to the full 2.0L.
Most people consider "bigger displacement" to be the key, so they ignore some of the other factors. This may prove to be, for some people, rather short sighted. It's likely that the 1.8L engine will never make MORE power than a built 2.0L given the setup, but the slightly wider options to choose from in the 1.8L might make it easier to make that power.
Dunno, guess we'll see wink
[ August 15, 2002, 07:41 AM: Message edited by: Red ]
Which, in turn, could allow the 1.8L version a higher redline than the 2.0L version.
Not a lot of people have tried this as I understand, but likely for good reason. The folks in Korea are taxed (HUGE taxes) by engine displacement, and it goes on 0.5L increments: 1.5L, then 2.0L, then 2.5L, etc. This is why the 1.8L motors aren't widely used there -- if you're gonna be taxed for 1.8L, you might as well go to the full 2.0L.
Most people consider "bigger displacement" to be the key, so they ignore some of the other factors. This may prove to be, for some people, rather short sighted. It's likely that the 1.8L engine will never make MORE power than a built 2.0L given the setup, but the slightly wider options to choose from in the 1.8L might make it easier to make that power.
Dunno, guess we'll see wink
[ August 15, 2002, 07:41 AM: Message edited by: Red ]
08-15-2002, 02:16 AM
#36
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Shaddoh-
I should have clarified. 2.0L Stock "shaped" pistions. You are correct, the stock pistions will NOT last for my 400 WHP project. The units I'll be ordering will be the Ross Forged units with an 0.080 overbore and the stock "pop top" (1mm dome) design.
Guys who asked for cams....do a search, the topic has been beat to death. The 1.8L intake cam is better than the 2.0L intake cam. The new beta2 XD intake cam is better than the 1.8L intake cam. Please don't hijack this thread.
I should have clarified. 2.0L Stock "shaped" pistions. You are correct, the stock pistions will NOT last for my 400 WHP project. The units I'll be ordering will be the Ross Forged units with an 0.080 overbore and the stock "pop top" (1mm dome) design.
Guys who asked for cams....do a search, the topic has been beat to death. The 1.8L intake cam is better than the 2.0L intake cam. The new beta2 XD intake cam is better than the 1.8L intake cam. Please don't hijack this thread.