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Old 11-12-2019, 07:37 PM   #31
WickEdSix98
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Default Re: 20 degree BBC w/alcohol

I have no dog in this fight but does anyone notice that the people fighting FOR methanol are the ones who have already spent money for an alcohol setup yet haven't ever run it.
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Old 11-12-2019, 10:17 PM   #32
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Default Re: 20 degree BBC w/alcohol

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I have no dog in this fight but does anyone notice that the people fighting FOR methanol are the ones who have already spent money for an alcohol setup yet haven't ever run it.
Not quite sure what that means Wicked, but I run mine every chance I get.
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Old 11-13-2019, 12:56 AM   #33
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Default Re: 20 degree BBC w/alcohol

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Originally Posted by Horndog View Post
Thanks ... overlooked it.


His cam is pretty close --- 3* shorter LSA and 4* shorter duration
3* lsa is "close" ? really? thats like saying an apple is close to a water buffalo
idiot
stay out of big boy discussions.

btw, I run an inch of lift at 8200 for 200 laps on springs and lifters

if you have a clue, its totally doable.
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Old 11-13-2019, 07:21 AM   #34
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Default Re: 20 degree BBC w/alcohol

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Originally Posted by goneracin View Post
3* lsa is "close" ? really? thats like saying an apple is close to a water buffalo
idiot
stay out of big boy discussions.

btw, I run an inch of lift at 8200 for 200 laps on springs and lifters

if you have a clue, its totally doable.
Bob, question for you. Have you guys done any methanol specific builds? If so, how did they compare to similar combos built for gas? What changes, if any, did you make to get them to run well?
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Old 11-13-2019, 08:07 AM   #35
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Default Re: 20 degree BBC w/alcohol

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Originally Posted by goneracin View Post
3* lsa is "close" ? really? thats like saying an apple is close to a water buffalo
idiot
stay out of big boy discussions.

btw, I run an inch of lift at 8200 for 200 laps on springs and lifters

if you have a clue, its totally doable.
Good advice here.....
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Old 11-13-2019, 09:05 AM   #36
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Default Re: 20 degree BBC w/alcohol

in a nut shell.......Alky will peek sooner in the rpm rage than gas and alky will make more TQ and peek sooner than gas,....but alky will loose on higher rpm motors.....(EX) for max effort N/A, Gas will make more in the upper rpm range...let say for conversation above 8500+,....in my own experience you should cam alky the same as gas,...for the heads, the chamber will need a lot less quench, a soft chamber will help a lot
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Old 11-13-2019, 10:06 AM   #37
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Default Re: 20 degree BBC w/alcohol

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in a nut shell.......Alky will peek sooner in the rpm rage than gas and alky will make more TQ and peek sooner than gas,....but alky will loose on higher rpm motors.....(EX) for max effort N/A, Gas will make more in the upper rpm range...let say for conversation above 8500+,....in my own experience you should cam alky the same as gas,...for the heads, the chamber will need a lot less quench, a soft chamber will help a lot
Ok, understandable. But a couple of more questions for you. If the power on alky peaks sooner than gas, and gas makes more power at higher rpm, what is the cause of this? There are alky combos out there that turn very high rpm and run very well. What was changed on those setups so they would? And how does cubic inches play into this, ie. "Big inch engines don't run well and will lose power on alky over gas"?
Why do some people say alky won't work with certain combos but other people have used it successfully? What are they doing different to make it work?

Trying to learn....while at the same time getting the thought process going.
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Old 11-13-2019, 10:15 AM   #38
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Exhaust valve opening and closing events are different for Methanol than Gas.
Gas has more Btu's then alky too.

In my opinion, they are not cammed the same as a gas engine.
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Old 11-13-2019, 10:24 AM   #39
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Default Re: 20 degree BBC w/alcohol

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Not quite sure what that means Wicked, but I run mine every chance I get.
Not directed at you as you have real world data that you’re sharing. Some of the others trying to help do not

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Old 11-13-2019, 10:55 AM   #40
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Default Re: 20 degree BBC w/alcohol

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Not directed at you as you have real world data that youíre sharing. Some of the others trying to help do not
Gotcha. I read it wrong, or it just didnít compute in my pea brain. Thanks
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Old 11-13-2019, 11:17 AM   #41
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Default Re: 20 degree BBC w/alcohol

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Ok, understandable. But a couple of more questions for you. If the power on alky peaks sooner than gas, and gas makes more power at higher rpm, what is the cause of this? There are alky combos out there that turn very high rpm and run very well. What was changed on those setups so they would? And how does cubic inches play into this, ie. "Big inch engines don't run well and will lose power on alky over gas"?
Why do some people say alky won't work with certain combos but other people have used it successfully? What are they doing different to make it work?

Trying to learn....while at the same time getting the thought process going.

i can only speak on my own junk,...when i say high i am talking 9000+, cam it correctly ( should ) work well with both fuels. but everyone has there own opinion and experience, the quench area is a place to look at when running alky.....again just my $0.02
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Old 11-13-2019, 11:33 AM   #42
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Default Re: 20 degree BBC w/alcohol

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Originally Posted by WickEdSix98 View Post
Not directed at you as you have real world data that youíre sharing. Some of the others trying to help do not
And your input is helping how? How about instead of making dumbass statements, ask a valid question or provide examples of your obviously unlimited profound knowledge and experience....
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Old 11-13-2019, 11:37 AM   #43
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Default Re: 20 degree BBC w/alcohol

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Originally Posted by RCM Racing engines View Post
Exhaust valve opening and closing events are different for Methanol than Gas.
Gas has more Btu's then alky too.

In my opinion, they are not cammed the same as a gas engine.
When run at the correct af ratios though, the total btu output of methanol fueled engines is actually higher than that of gas. Plenty of data to prove that.

As to the cam, what differences are there between the two, and what kind of profile would benefit each fuel the most?
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Old 11-13-2019, 11:40 AM   #44
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Default Re: 20 degree BBC w/alcohol

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i can only speak on my own junk,...when i say high i am talking 9000+, cam it correctly ( should ) work well with both fuels. but everyone has there own opinion and experience, the quench area is a place to look at when running alky.....again just my $0.02
Ok, regarding the quench area, what favors alky? More or less? I've heard of guys picking up performance when running a softened chamber over a standard one, but would that be a typical thing or more of a specific build deal?
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Old 11-13-2019, 12:06 PM   #45
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Default Re: 20 degree BBC w/alcohol

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,...for the heads, the chamber will need a lot less quench, a soft chamber will help a lot
Hmmm. Flame speed of the fuel?

Do these 20 degree and less angled heads have a large quench pad? Would rolling the quench pad towards the plug help?
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