Topic: Compression Ratio and Head Gaskets (Read 300 times)
derost
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Compression Ratio and Head Gaskets
« Thread Started on Sept 15, 2005, 6:11pm »
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Does anyone know what the stock compression ratio is for the 1.6? I'd like to mildly boost my engine in the mid-future.
Also, I've heard people will use 2+ headgaskets to lower compression. Is this the normal route?
Thanks!
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aveoike
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Re: Compression Ratio and Head Gaskets
« Reply #1 on Sept 15, 2005, 6:22pm »
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the headgasket i dont know about, but i know that if use 2 gaskests on something else, it will leak. our compresion ratio is 9.5 to 1
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Re: Compression Ratio and Head Gaskets
« Reply #2 on Sept 15, 2005, 7:28pm »
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is it 9.5 :1 ? i thought it was something like 10 : 1 (thats jut wat i heard)
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Re: Compression Ratio and Head Gaskets
« Reply #3 on Sept 15, 2005, 8:10pm »
-------------------------------------------------------------------------------- http://www.chevrolet.com/aveo/specifications/ Click on the "Engine" tab, its the same as the 04 and 05's but it show 06 specs. this will tell you everything you need to know on our little engine that could.
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Re: Compression Ratio and Head Gaskets
« Reply #4 on Sept 15, 2005, 8:52pm »
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thanks aveoike..sorry for my mistake
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Re: Compression Ratio and Head Gaskets
« Reply #5 on Sept 16, 2005, 2:11pm »
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Thanks! I guess 9.5:1 isnt too bad for low boost -- I was expecting in the range of like 11:1 like some cars.
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Re: Compression Ratio and Head Gaskets
« Reply #6 on Sept 16, 2005, 11:51pm »
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id be careful boosting it. im really doubting it can handle boost(like significant boost, not 2-3 psi which isnt worth the money) without reinforced everything
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Re: Compression Ratio and Head Gaskets
« Reply #7 on Sept 17, 2005, 8:30am »
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im new to boosting, what parts do you have to reinforce?
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Re: Compression Ratio and Head Gaskets
« Reply #8 on Sept 17, 2005, 12:35pm »
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most likely pistons and all the internal stuff..otherwise ull get a nice little hole in the piston(p.s. ive seen it happen and engine usually doesnt work with a hole in it )
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Re: Compression Ratio and Head Gaskets
« Reply #9 on Sept 18, 2005, 11:21am »
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The 1.6 in the Aveo can handle 5- 7 psi, no problem. you can get about 150 to 170 hp on stock internals. You guys need to start visitiing Daewootech.com
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Re: Compression Ratio and Head Gaskets
« Reply #10 on Sept 18, 2005, 12:19pm »
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i usually do.. is there a post on that there?
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Re: Compression Ratio and Head Gaskets
« Reply #12 on Feb 9, 2006, 3:20am »
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throw another gasket on there and you'll be good for like 12-15 pounds i'd think.. i'd have to see the stock gasket.. and also does anyone know about the d16 header fit
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Re: Compression Ratio and Head Gaskets
« Reply #13 on Feb 9, 2006, 8:35am »
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I think brian already tried that and it didnt fit
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Feb 9, 2006, 3:20am, madmike wrote:throw another gasket on there and you'll be good for like 12-15 pounds i'd think.. i'd have to see the stock gasket.. and also does anyone know about the d16 header fit
ok first off the whole 2 gasket thing doesn't work. there is no way you can fit two with out having custom headbolts made. the Headbolts are made to a specific length for a reason. and The D16 Engine has no simmalarities to our X16X derrived motor, and stock internals are only good for 7psi at the max.
exodus
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Re: Compression Ratio and Head Gaskets
« Reply #15 on Feb 9, 2006, 1:47pm »
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Adjusting valve timing is a much better method of controlling compression, and much more accurate... go with that route.
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Re: Compression Ratio and Head Gaskets
« Reply #16 on Feb 12, 2006, 8:43pm »
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I would watch that or your gonna end up with bent valves.
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Re: Compression Ratio and Head Gaskets
« Reply #17 on Feb 17, 2006, 8:26pm »
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Here is a corsa with an 8V bottom end and 16V top end.... he's making 275hp and 239 lb-ft of torque on 20.6 PSI of boost.
I haven't been able to deterimine what piston compression he had in his original South African 1.6L SOHC engine..... I think the 1.6L SOHC (Pontiac Lemans) runs around 8.8:1 here in north america.
here is his link..... the corsa is roughly the same size as the Aveo..... who knows..... a good portion of the Aveo might be based upon the Corsa...... The Lanos was based on the slightly larger Astra MKII.
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Re: Compression Ratio and Head Gaskets
« Reply #18 on Feb 17, 2006, 8:30pm »
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Technically.... the american market low compression pistons from the 1.6L SOHC would be a direct fit into your Aveo engine should someone want to turbo their vehicle.
I would guess that the pistons might have to be machined to allow for valve clearance.... hard to say..... I haven't looked at them yet.
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Re: Compression Ratio and Head Gaskets
« Reply #19 on Feb 23, 2006, 4:06am »
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im thinking of boost my engine anyone know what would be better
a supercharger or a turbo i have the 4-speed automatic and where i can find one i have looked allover the net an i havent found one for the aveo yet
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Re: Compression Ratio and Head Gaskets
« Reply #20 on Feb 23, 2006, 7:48am »
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here read this thread it is for a turbo system made for our engine....also tells you how much hp your auto can hold(200hp)
05aveohotrod
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Re: Compression Ratio and Head Gaskets
« Reply #21 on Feb 23, 2006, 9:33am »
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The D16 header will fit (aftermarket) but you have to do some serious machining. All of the bolt holes have to be hogged out and you really need to port match the head to the header since the header is a larger diameter than our heads (I will when the time comes to install). I've been working on my turbo header at work off and on for three weeks and it'll be a while still. Best bet for somebody who doesn't want to do all the work would be a 50shot wet kit nitrous system. You'll get about the same power as 5psi of boost with out all the headaches. I'm so deep into it now, I might as well finish it.
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Re: Compression Ratio and Head Gaskets
« Reply #22 on Feb 23, 2006, 12:18pm »
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so basically for some one who just wants a bolt-on header the d16 isn't a good fit because of all the work that has to be done to get it to fit on...... 360dynamic sells turbo headers and the turbo header that picture looks pretty nice....that kit also includes forged pistons that lower compression(tryin to stay with in the topic of the thread lol)
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05aveohotrod
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Re: Compression Ratio and Head Gaskets
« Reply #23 on Feb 24, 2006, 12:01am »
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Its pretty much around the same lines with any type of custom work. Its a PITA to do, get little gains sometimes, and its usually visually ugly. And by the way, you can stack headgaskets without leaking. You do have to put in new longer headbolts but it has been done. I did it on my Formula with my LT4 on the rebuild. I ran a pretty large nitrous load (150 primary with a 75 shot secondary) and needed to get from 10.5 down to 8.5. Just the 2 layer gasket didn't get as low as I wanted, but it got down to 9.5.
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precisionboost
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Re: Compression Ratio and Head Gaskets
« Reply #24 on Mar 5, 2006, 8:59pm »
Feb 9, 2006, 10:18am, EnigmaM4n wrote:
Feb 9, 2006, 3:20am, madmike wrote:throw another gasket on there and you'll be good for like 12-15 pounds i'd think.. i'd have to see the stock gasket.. and also does anyone know about the d16 header fit
ok first off the whole 2 gasket thing doesn't work. there is no way you can fit two with out having custom headbolts made. the Headbolts are made to a specific length for a reason. and The D16 Engine has no simmalarities to our X16X derrived motor, and stock internals are only good for 7psi at the max.
I haven't been here much.... but are you sure this guy works for GM??
Did he ever show proof?
Was he a design engineer? (what was his job?)
If he's an engineer... I am very surprized at the vagueness of his posts.... so far I haven't come accross anything I would consider serious technical knowledge.
7psi is nothing.... that's perhaps 150hp... and considering Lotus tested this engine at 148bhp on a test bench and found absolutely no issues with reliability I have to wonder why he's saying it's only good for 7psi.
I don't mean to be pushy... but the more I read his posts the more suspicious I find myself becoming.
As for compression ratio reduction via head gasket.... see my post in the forced induction area.
If bolting up the head is a problem...... I'm sure ARP makes cylinder head stud conversion kits ( I have one for my 2.0L as well as a set of bolts for the connecting rods)
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Re: Compression Ratio and Head Gaskets
« Reply #25 on Mar 12, 2006, 4:01am »
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Considering the car originates in Korea and Holden is the primary shareholder ( GM's portion) and it's originally a Holden engine..... you would think GMDAT (Holden & Daewoo) would be the one doing the testing.
You will notice down below that the Port Melbourn plant ships a great number of Familly II engines to places like South Korea..... the 1.8L and 2.0L are Familly II engines.
It looks like all the Family I engines (such as the 1.6L in the Aveo ) are manufactured in the Daewoo plants (castings from GM)
In Korea and many other places in the world the 1.4L is standard in the Kalos/Aveo and the 1.6L is standard in the Lacetti/Optra 5/Reno
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