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increasing compression on NA6 

 

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 Post subject: increasing compression on NA6
Posted: Mon Sep 19, 2011 12:38 am 
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just wanted to know if its worthwhile going down the path of increasing the comp on a xr6 with mild mods (intake, zorst, tune). reason for asking this is, i want to swap over to E85 once it becomes more available, and if the engine has high compression and is tuned properly E85 can yield more power over a 98RON tuned motor.
also just after a rough pricing and exactly what is involved in increasing the compression.
thanks

 

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 Post subject: Re: increasing compression on NA6
Posted: Mon Sep 19, 2011 11:51 am 
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new pistons basically, might as well freshen the bottom end while your there.

 

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 Post subject: Re: increasing compression on NA6
Posted: Mon Sep 19, 2011 12:00 pm 
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chris sieclay wrote:
new pistons basically, might as well freshen the bottom end while your there.

no one would pull a motor down throw in new pistons and not bother with getting a hone at least and some new bearings,
winman wrote:
reason for asking this is, i want to swap over to E85 once it becomes more available, and if the engine has high compression and is tuned properly E85 can yield more power over a 98RON tuned motor.

i think where they already have e85 at some servos but its not a reliable mixture, i thought i read somewhere that it was only "up to 85%" but it wasnt a reliable enough mix to tune an engine to it for performance unless you were buying the proper stuff suitable for racing,
i could of dreamt that though lol

 

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 Post subject: Re: increasing compression on NA6
Posted: Mon Sep 19, 2011 12:49 pm 
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bry40l wrote:
chris sieclay wrote:
new pistons basically, might as well freshen the bottom end while your there.

Quote:
no one would pull a motor down throw in new pistons and not bother with getting a hone at least and some new bearings,


A hone.. with new pistons? lol.

mate im talking machining and a rebalance.

 

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 Post subject: Re: increasing compression on NA6
Posted: Mon Sep 19, 2011 1:04 pm 
Getting Side Ways
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Quote:
i think where they already have e85 at some servos but its not a reliable mixture, i thought i read somewhere that it was only "up to 85%" but it wasnt a reliable enough mix to tune an engine to it for performance unless you were buying the proper stuff suitable for racing,
i could of dreamt that though lol

hmmm yes i have heard small rumors stating pretty much this :?
also wouldn't it be cheaper and easier to get the head shaved rather then change the pistons?

 

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BA XR6
Performance mods: typhoon + territory pipe with K&N filter, full exhaust, BPR generic tune, lowered, xr6t front brakes, territory rear brakes
Visual mods: 19" rim, lower grill mesh, oil pressure and vacuum gauges, engine bay lighting, foot well lights
some of my main mods

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 Post subject: Re: increasing compression on NA6
Posted: Mon Sep 19, 2011 1:07 pm 
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How much more comression do you want?

 

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 Post subject: Re: increasing compression on NA6
Posted: Mon Sep 19, 2011 1:22 pm 
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Or what say you just get your motor tuned for E85 and see how you like it, we converted a carb setup for E85 using teflon lines etc, needed about 30% more fuel to get the mixtures sweet and by crikey it was near on impossible to get it to ping. ;)
Seemed to have the characteristics of methanol.

 

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 Post subject: Re: increasing compression on NA6
Posted: Mon Sep 19, 2011 1:42 pm 
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Quote:
How much more comression do you want?

i don't want to go over the top, i was thinking 10-11:1 provided ive picked up the right info and a BA mk2 xr6 has stock 9.7:1 ratio.
but before i would actually get this done E85 would have to go down in price, ive heard some reports saying you save literally 5cents per 100km's. E85 is predicted to go down in price once it becomes more common, im hoping by this time it will actually be E85, not E85 *up to 85% ethanol.

 

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BA XR6
Performance mods: typhoon + territory pipe with K&N filter, full exhaust, BPR generic tune, lowered, xr6t front brakes, territory rear brakes
Visual mods: 19" rim, lower grill mesh, oil pressure and vacuum gauges, engine bay lighting, foot well lights
some of my main mods

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 Post subject: Re: increasing compression on NA6
Posted: Mon Sep 19, 2011 2:44 pm 
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Find a wrecked Egas falcon and use the engine out of that.

Or if you wan't to stick with your own engine, strip it a measure it and buy a set of genuine egas pistons.

 

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 Post subject: Re: increasing compression on NA6
Posted: Mon Sep 19, 2011 6:01 pm 
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tickford_6 wrote:
Find a wrecked Egas falcon and use the engine out of that.

Or if you wan't to stick with your own engine, strip it a measure it and buy a set of genuine egas pistons.

if using the Egas motor with E85 or lpg,will the ecu sparkmaps cope or do you need a after market ecu to get it spot on?

 

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 Post subject: Re: increasing compression on NA6
Posted: Mon Sep 19, 2011 6:22 pm 
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winman wrote:
Quote:
How much more comression do you want?

i don't want to go over the top, i was thinking 10-11:1 provided ive picked up the right info and a BA mk2 xr6 has stock 9.7:1 ratio.
but before i would actually get this done E85 would have to go down in price, ive heard some reports saying you save literally 5cents per 100km's. E85 is predicted to go down in price once it becomes more common, im hoping by this time it will actually be E85, not E85 *up to 85% ethanol.

funny that--10-11\1 compression,my last 6 186-192,250 xflow,v6 vn all where set up on 10.5\1,now the 302w will be next,all lpg\petrol.cam grinds to suit lpg and porting.could try the E85 on the 302w,as i can change timing.

 

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 Post subject: Re: increasing compression on NA6
Posted: Tue Sep 20, 2011 9:06 am 
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hans hartman wrote:
tickford_6 wrote:
Find a wrecked Egas falcon and use the engine out of that.

Or if you wan't to stick with your own engine, strip it a measure it and buy a set of genuine egas pistons.

if using the Egas motor with E85 or lpg,will the ecu sparkmaps cope or do you need a after market ecu to get it spot on?




don't understand your question

 

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 Post subject: Re: increasing compression on NA6
Posted: Tue Sep 20, 2011 10:22 am 
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you would run an aftermarket computer or chip and get it tuned for e85

 

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xr8 snorkel,typhoon lower snorkel,territory intake pipe,20% underdrive kit,pacemaker extractors,high flow cat,xforce exhaust,t56 conversion hd turbo clutch/ flywheel,m86 3.45 lsd,custom tune187.1rwkw as an auto

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 Post subject: Re: increasing compression on NA6
Posted: Tue Sep 20, 2011 10:22 am 
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tickford_6 wrote:
hans hartman wrote:
tickford_6 wrote:
Find a wrecked Egas falcon and use the engine out of that.

Or if you wan't to stick with your own engine, strip it a measure it and buy a set of genuine egas pistons.

if using the Egas motor with E85 or lpg,will the ecu sparkmaps cope or do you need a after market ecu to get it spot on?




don't understand your question


not sure either, i think he means his ignition and fuel curves?

If that is the case then for us it was around 22% more fuel for part throttle openings and round 40% wide open throttle. (stoich was 9.76)
Used 22 degrees advance all up @ 6500 (stock motor).. got a 12% increase in power on the dyno.
Dont know why people want to immediatley jump for after market engine management systems. The one on the BA for instance is incredible.
Edit: E85 is affected by the weather, get it tuned in the summer and it'll be ok for winter.

 

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 Post subject: Re: increasing compression on NA6
Posted: Tue Sep 20, 2011 11:26 am 
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E85 at the pump is not consistant as 98 pump...

 

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