Clear up 1.8L and 2.0L Beta differences
08-01-2002, 03:11 PM
#21
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Red and I were just discussing this not 60 minutes ago.
The 2.0L has an unfavorable rod/stroke ratio. To make a long story short, it is the reason torque drops off so sharply after about 5000 RPM.
Going with the 1.8L crank and rods, and overboring the 1.8L block to 2.0L would make for a killer combination.
I'm looking into the possibilities of doing this now. Also, The HLA's being the limiting factor in high RPM performance is not necessarly true as we all though. Mitsu motors use HLS's and rev to 8300.
So to sum up...using the 1.8L crank, upgraded 1.8L rods, larger pistions to bring displacement up to 2.0L, and retaining the stock head, should lead to better high RPM gains than attemping to trick out a 2.0L to 2.1L or 2.2L
The 2.0L has an unfavorable rod/stroke ratio. To make a long story short, it is the reason torque drops off so sharply after about 5000 RPM.
Going with the 1.8L crank and rods, and overboring the 1.8L block to 2.0L would make for a killer combination.
I'm looking into the possibilities of doing this now. Also, The HLA's being the limiting factor in high RPM performance is not necessarly true as we all though. Mitsu motors use HLS's and rev to 8300.
So to sum up...using the 1.8L crank, upgraded 1.8L rods, larger pistions to bring displacement up to 2.0L, and retaining the stock head, should lead to better high RPM gains than attemping to trick out a 2.0L to 2.1L or 2.2L
08-02-2002, 02:53 AM
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I think our 1.6 Betas share the same crank with the 1.8, but they carry smaller pistons. So our engines do rev (I can easyly reach 7200 in 3rd gear) it's only they have less torque. But Gear ratios are different too, and the difference between a 1.6 and 1.8 is the last one shows more fury on the 2000 to 4500 rpm band. My wife has a standard 1.8 so I get to drive both all the time.
There is very little you can do to a 1.6 to improve power, not to mention is nearle impossible to upgrade it to a 1.8 or 2.0 Beta, unless you spend enough like to buy a hole new engine.
There is very little you can do to a 1.6 to improve power, not to mention is nearle impossible to upgrade it to a 1.8 or 2.0 Beta, unless you spend enough like to buy a hole new engine.
08-02-2002, 12:37 PM
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Random, keep in mind that in order to bring a 1.8 to 2.0 with only a bore size change you'll have to overbore it 4.35mm (0.171") wich is kinda big...make sure the block has enough meat to stand that overbore
Denis
Denis
08-02-2002, 01:14 PM
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Umm... Well frankly I dont have the specs on the aussie accent. sad.gif I know that the 1.6L DOHC Alpha III's bore and stroke were increased, with higher lift camshafts, and got the dreaded returnless fuel system (and the wonderful MAP sensor) as compared to the US spec 1.5L DOHC alpha II... I know very very little about the 1.5L DOHC alpha III sold overseas.
I believe the head is the same, the blocks should be close, and the ports should be close too.
Maybe you could check at the local dealer and get the price for a service manual for you car and add that to my price for your header (if we can come to a deal).
If not, i'd still like to get a copy of that for the not-so-little accent FAQ i'm workin on.
I believe the head is the same, the blocks should be close, and the ports should be close too.
Maybe you could check at the local dealer and get the price for a service manual for you car and add that to my price for your header (if we can come to a deal).
If not, i'd still like to get a copy of that for the not-so-little accent FAQ i'm workin on.
08-02-2002, 07:49 PM
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<div class='quotetop'>QUOTE</div><div class='quotemain'>Denisst99:
Random, keep in mind that in order to bring a 1.8 to 2.0 with only a bore size change you'll have to overbore it 4.35mm (0.171") wich is kinda big...make sure the block has enough meat to stand that overbore</div>Sorry, I sort of mis-stated some info above. Let me clairify.
The "bore" of the 1.8L and 2.0L are the same. The difference is in the stroke (crank and rods). Going with the 1.8L crank and rods, would turn any 2.0L into a 1.8L.
The "normal" overbore of 0.040" (1mm) (which is the max reccomended) turns the block into a 2.02L or 1.84L, depending on which crank/rods you have.
I'm considering going with a 0.098" (2.5mm) overbore to bring the overall volume to 2.1L, only using the 1.8L crank/rods to make it into a 1.91L.
This will give me the more favorable rod/stroke ratio for high RPM performance, at the expense of low RPM torque.
Now...if I can only beef up the bottom end to withstand 8000 to 8500 RPM...I might have a winning combination.
For the folks who want to know about the 1.6L Beta. It uses the same 85mm stroke as the 1.8L, but has a 77.5mm bore. I honestly do not know if hyundai just installed extra thick sleeves in the 1.6L, or if they are actually "normal" thickness sleeves in a smaller block passage. Someone would have to rip one down/apart to find out.
Random, keep in mind that in order to bring a 1.8 to 2.0 with only a bore size change you'll have to overbore it 4.35mm (0.171") wich is kinda big...make sure the block has enough meat to stand that overbore</div>Sorry, I sort of mis-stated some info above. Let me clairify.
The "bore" of the 1.8L and 2.0L are the same. The difference is in the stroke (crank and rods). Going with the 1.8L crank and rods, would turn any 2.0L into a 1.8L.
The "normal" overbore of 0.040" (1mm) (which is the max reccomended) turns the block into a 2.02L or 1.84L, depending on which crank/rods you have.
I'm considering going with a 0.098" (2.5mm) overbore to bring the overall volume to 2.1L, only using the 1.8L crank/rods to make it into a 1.91L.
This will give me the more favorable rod/stroke ratio for high RPM performance, at the expense of low RPM torque.
Now...if I can only beef up the bottom end to withstand 8000 to 8500 RPM...I might have a winning combination.
For the folks who want to know about the 1.6L Beta. It uses the same 85mm stroke as the 1.8L, but has a 77.5mm bore. I honestly do not know if hyundai just installed extra thick sleeves in the 1.6L, or if they are actually "normal" thickness sleeves in a smaller block passage. Someone would have to rip one down/apart to find out.
08-05-2002, 05:36 AM
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OK lantraluvr, just let me know when you rip your engine apart. I have a doubt about the bore difference and the head. Suposse you have a smaler bore, you coudn't use the same head as 1.8 because there would be like an edge on the union because the head is larger than the cylindeer would be?
