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Old 02-29-2012, 06:26 PM   #16
nesluopetan
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Default Re: Stay with 8-71 or upgrade to 14-71?

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It's only money....you get more next Friday. I have a teflon stripped Blower shop 14:71 and it makes 6# at 15% under on my 555. At 12% over it makes 12# of boost, which I don't advise with pump gas. Don't forget to factor in a crap cap distributor and a crank trigger in the upgrade price. Possibly a timing control if you want any kind of advance curve. Then you have some pulley alignment issues to deal with because of the crank trigger, etc. etc.

I run a AEM EPM with dual optical outputs ( cam/crank ) I wont have any to worry about any clearance issues since i'm not running a distributor and the timing control is all ran through my ecu..
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Old 02-29-2012, 06:27 PM   #17
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Default Re: Stay with 8-71 or upgrade to 14-71?

Yuuuup Go big you only live once .
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Old 02-29-2012, 06:47 PM   #18
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Default Re: Stay with 8-71 or upgrade to 14-71?

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I run a AEM EPM with dual optical outputs ( cam/crank ) I wont have any to worry about any clearance issues since i'm not running a distributor and the timing control is all ran through my ecu..
You didn't give any info on the car??? And what the hell does your screen name mean......lol
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Old 02-29-2012, 06:49 PM   #19
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Talking Re: Stay with 8-71 or upgrade to 14-71?

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Originally Posted by 66chevy555 View Post
It's only money....you get more next Friday. I have a teflon stripped Blower shop 14:71 and it makes 6# at 15% under on my 555. At 12% over it makes 12# of boost, which I don't advise with pump gas. Don't forget to factor in a crap cap distributor and a crank trigger in the upgrade price. Possibly a timing control if you want any kind of advance curve. Then you have some pulley alignment issues to deal with because of the crank trigger, etc. etc.
"Crap cap".......
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Old 02-29-2012, 07:05 PM   #20
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Default Re: Stay with 8-71 or upgrade to 14-71?

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You didn't give any info on the car??? And what the hell does your screen name mean......lol

lol my screen name is my name backwards.. it's always available


56 chevy
8-71 stage 3 blower
enderle bird catcher
custom fuel plate and rails
8- 1200cc injectors
megasquirt 3x EMS
AEM EPM w/ crank-cam optical sensors
8- gm coil packs off chevy avalanche
merlin 540
4.5 bore 4.25 stroke 6.385 rod
4340 rods and crank
8:1 blower pistons
merlin III aluminum heads 2.3/1.88 rectangular port 310cc
jakes 4l80 stage 3 transmission w/ trans brake & billet 3200 lockup converter
9" rear, wave trac 35 spline w/ 3.50 gears
4 wheel 4 piston brakes, hydroboost
power rack and pinion steering


what else do you want to know? lol


It's not about " going big or go home " I just want to make sure this 14-71 will be a better choice for pump gas on my car.. If it's not going to help me much I'll stick with what I have, but if I can run a little more boost on 1:1 ratio safely without needing to over drive it then why not? That's my dilemma here. To me, a 14-71 @ 1:1 ratio is a lot safer and more forgiving than a 8-71 @ 13% OD ?

Last edited by nesluopetan; 02-29-2012 at 07:09 PM.
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Old 02-29-2012, 07:10 PM   #21
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Default Re: Stay with 8-71 or upgrade to 14-71?

Quote:
Originally Posted by nesluopetan View Post
lol my screen name is my name backwards.. it's always available


56 chevy
8-71 stage 3 blower
enderle bird catcher
custom fuel plate and rails
8- 1200cc injectors
megasquirt 3x EMS
AEM EPM w/ crank-cam optical sensors
8- gm coil packs off chevy avalanche
merlin 540
4.5 bore 4.25 stroke 6.385 rod
4340 rods and crank
8:1 blower pistons
merlin III aluminum heads 2.3/1.88 rectangular port 310cc
jakes 4l80 stage 3 transmission w/ trans brake & billet 3200 lockup converter
9" rear, wave trac 35 spline w/ 3.50 gears
4 wheel 4 piston brakes, hydroboost
power rack and pinion steering


what else do you want to know? lol


It's not about " going big or go home " I just want to make sure this 14-71 will be a better choice for pump gas on my car.. If it's not going to help me much I'll stick with what I have, but if I can run a little more boost on 1:1 ratio safely without needing to over drive it then why not? That's my dilemma here. To me, a 14-71 @ 1:1 ratio is a lot safer than a 8-71 @ 13% OD ?
I tell my customers if you can buy a 14-71 blower you can get some gas.
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Old 02-29-2012, 07:40 PM   #22
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Default Re: Stay with 8-71 or upgrade to 14-71?

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I tell my customers if you can buy a 14-71 blower you can get some gas.

I drive my car all summer long, I don't like the thought of spending money for 91 octane in this car ever mind race fuel. This is why I'm building a pump gas car because I know it's going to be very thirsty.

Come on blower guys, Will a 8-71 @ 13% OD run a lot hotter than a 14-71 @ 1:1 ratio? They will probably make similar power right? So as long as I can fit the 14-71 is there any down sides to upgrading? The 14-71 will be safer on pump gas due to heat ( detonation ) issues and also give me more wiggle room for higher HP #'s right? as far as air intake temps below the blower what temp is considered too hot for pump gas?

Last edited by nesluopetan; 02-29-2012 at 07:43 PM.
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Old 02-29-2012, 07:53 PM   #23
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Default Re: Stay with 8-71 or upgrade to 14-71?

corky bell has a formula for octane to use with total combustion temp.maybe you have not read it.
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Old 02-29-2012, 08:11 PM   #24
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Default Re: Stay with 8-71 or upgrade to 14-71?

66chevy your chevyII sure looks bad ass!!!!

So nesluopetan, the blower shop will sell you a new 1471 for $1500?

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Old 02-29-2012, 08:12 PM   #25
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Default Re: Stay with 8-71 or upgrade to 14-71?

Yes the smaller blower turning faster is going to create more heat than the larger blower turning slower. Do you only have a choice of a 14-71 or 8-71, the deal is not good for anything in between (10 or 12)?

The only downside to going bigger on the blower is you may lose a little torque down low. This may not be an issue at all with your combination.

Another option is to just run E-85 and keep your 8-71.
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Old 02-29-2012, 09:06 PM   #26
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Default Re: Stay with 8-71 or upgrade to 14-71?

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66chevy your chevyII sure looks bad ass!!!!

So nesluopetan, the blower shop will sell you a new 1471 for $1500?
No, they will take my new one back and upgrade me to the 14-71 for 1500.00 if I decide to do it... My blower is practically brand new still, just got the car running not too long ago and this is why I need to make a decision soon because if I use the blower any more they are not willing to offer me the upgrade ( which is understandable )
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Old 02-29-2012, 09:08 PM   #27
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Default Re: Stay with 8-71 or upgrade to 14-71?

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Yes the smaller blower turning faster is going to create more heat than the larger blower turning slower. Do you only have a choice of a 14-71 or 8-71, the deal is not good for anything in between (10 or 12)?

The only downside to going bigger on the blower is you may lose a little torque down low. This may not be an issue at all with your combination.

Another option is to just run E-85 and keep your 8-71.
Not enough e-85 stations around me to justify it, especially with the mileage i'll get with it. I can ask them about the 10 or 12-71 and see if it's a option. I think they have a spare 14-71 in stock which is why they offered it to me but I can find out for sure.
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Old 02-29-2012, 09:28 PM   #28
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Default Re: Stay with 8-71 or upgrade to 14-71?

Well I have a brand new 10-71 with billet rotors along with the anodized coating. My motor is a tall deck 598 and and it wouldn't hurt for me to go to 14-71. I don't think they make a 12-71, at least that's what I was told when I purchased my blower. Anyway if you decide you would prefer a 10-71 let me know if it helps that I have this one. I'm ok with it but if I went to the 14 I could live with that as well.
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Old 02-29-2012, 10:51 PM   #29
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Default Re: Stay with 8-71 or upgrade to 14-71?

If your just putting around you can run a ton of timing more than you normally would.You could have a dial on your dash.I have customers running well over 40 deg timing and when they rip around turn the dial and pull some timing .If your altitude is that bad you probably be amazed how much timing you could get by with.jmo But there is always some way around everything.We do several blower engines a year and most guys come to me are happy if they didnt use over 4 gals per burnout.Im lucky we have e85 everywhere .But we drive ours around all the time too.Hell i backed mine in the yard last week and got stuck in the snow.
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Old 02-29-2012, 11:01 PM   #30
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Default Re: Stay with 8-71 or upgrade to 14-71?

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Not enough e-85 stations around me to justify it, especially with the mileage i'll get with it. I can ask them about the 10 or 12-71 and see if it's a option. I think they have a spare 14-71 in stock which is why they offered it to me but I can find out for sure.

I'm not telling you to go with a 10 or even a 12, just curious why you were only saying 14. The price is right for sure, sounds like you have everything to support the swap to a 14 so why not go for it.
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