What fuel to run???

« **on:** February 09, 2016, 05:46:17 PM »

So I bought a new boat few weeks back. Debating on what fuel to run.

It's a bbf 521
Aluminum trick flow head
Single carb 1150
Don't know cam specs
Says it around 10.7:1

Motors we'll build seen pics of build deff done right. Claims he ran 91 mixed with AV gas. Right now I've got straight AV gas with marvels mystery oil. In my buggy I run straight vp110 and it gets pricey. So would like opinions from people who are knowledgeable in this.

Run...
91 straight....?
91/AV
91/110vp
AV straight
AV/marvels mystery oil
110vp straight

Wanna keep the cost down but not worth hurting the motor over so I'll run any of the above just don't wanna be say running 110vp when I can get away with 91. AV gas seems a lil cheaper than vp but seems like a pain to get unless your by the river where they have it at the pump. 110 I usually have from my buggy and 91 would be awesome but don't know if it's safe to run without worrying. Any advice would be awesome. Thanks codey

« **Reply #1 on:** February 09, 2016, 05:49:11 PM »

I'd run straight AV gas

Sent from my iPhone using SoCal Jet Boats

« **Reply #2 on:** February 09, 2016, 05:55:25 PM »

Quote from: Oliver1421 on February 09, 2016, 05:49:11 PM

I'd run straight AV gas

Sent from my iPhone using SoCal Jet Boats

My dad tells me not good to run straight as it has no lubricants in it? Is this an old myth or true stuff?

« **Reply #3 on:** February 09, 2016, 06:06:03 PM »

Run some marvel's mystery oil.

Sent from my iPhone using SoCal Jet Boats

« **Reply #4 on:** February 09, 2016, 06:15:00 PM »

So your saying AV gas is the fuel for my motor nothing mixed?? If so where do you guys all get your AV gas from?

« **Reply #5 on:** February 09, 2016, 06:17:21 PM »

I don't run it but I do know of a few places. Where do you live

Sent from my iPhone using SoCal Jet Boats

« **Reply #6 on:** February 09, 2016, 06:21:48 PM »

Riverside airport or corona airport. There is a lot of factor you maybe fine on 91. Depends on timing and cam for exact needs.

Sent from my iPhone using SoCal Jet Boats

« **Reply #7 on:** February 09, 2016, 06:29:52 PM »

Quote from: jimpen on February 09, 2016, 06:17:21 PM

I don't run it but I do know of a few places. Where do you live

Sent from my iPhone using SoCal Jet Boats

Menifee ca
I'll try and get cam specs but doubt he'll have them. I'd love to run 91 if I know it will take hurt the motor.

« **Reply #8 on:** February 09, 2016, 06:31:26 PM »

Quote from: 77_liberty on February 09, 2016, 06:29:52 PM

Menifee ca
I'll try and get cam specs but doubt he'll have them. I'd love to run 91 if I know it will take hurt the motor.

. Drop the timing back and check the plugs.

Sent from my iPhone using SoCal Jet Boats

« **Reply #9 on:** February 09, 2016, 06:36:07 PM »

Previous owner states he built the motor so if he had to run 91 he could. Said he always mixed half 91 half AVgas when possible. Says he ran on straight 91 a few times when had to and didn't seem to ping or act funny. I'm pretty knowledgeable on motor but when it comes to fine tuning i get lost on this stuff. I'm not worried about cost as much as I am on availability.

« **Reply #10 on:** February 09, 2016, 06:38:17 PM »

AV gas out of the pump is very common in lake havasu. I've heard of people doing the old marvel mystery trick but I also know a lot of people who run it straight without problems. U could take some timing out of it if u could verify can specs to be sure. I've been in this same situation with the motor out of my old offroad racetruck and it sucked. Fuel costs were ridiculous at 3.5 mpg. I used to run 110 vp and 91 mix and it was a pain in the ass.

Sent from my iPhone using SoCal Jet Boats

« **Reply #11 on:** February 09, 2016, 07:25:30 PM »

Run it on each with timing adjusted accordingly and check the plugs.

JMO

« **Reply #12 on:** February 09, 2016, 07:28:32 PM »

Quote from: 77_liberty on February 09, 2016, 05:55:25 PM

My dad tells me not good to run straight as it has no lubricants in it? Is this an old myth or true stuff?

Completely true.

Aviation fuel is very "dry"

We used to run either Marvel Mystery oil at like 200:1 or Amsoil two stroke oil at 300:1.

« **Reply #13 on:** February 09, 2016, 08:12:36 PM »

K so I got this from previous owner.
Cam specs

.580 lift. 242 in. 246ex. @ .050. Ground on 110 C/L. In @ 106 intake.

« **Reply #14 on:** February 09, 2016, 08:43:15 PM »

My dad has run AV gas in his day cruiser dry with no problems with a blown injected small block at 9.1 with 15lbs of boost, on a forced induction engine you can leave the exhaust valve seals out which helps with the dry cylinder thing, a n/a deal it's not a bad idea to run some marvel in it, also AV at an airport has to be tested daily and the quality is generally better then a lot of the gas at gas stations which now contains up to 10% ethanol that can be hard on rubber seals and hoses, in my opinion, I would run straight AV with the marvel oil

Sent from my iPhone using SoCal Jet Boats

« **Reply #15 on:** February 09, 2016, 09:00:52 PM »

Quote from: K-034 on February 09, 2016, 08:43:15 PM

My dad has run AV gas in his day cruiser dry with no problems with a blown injected small block at 9.1 with 15lbs of boost, on a forced induction engine you can leave the exhaust valve seals out which helps with the dry cylinder thing, a n/a deal it's not a bad idea to run some marvel in it, also AV at an airport has to be tested daily and the quality is generally better then a lot of the gas at gas stations which now contains up to 10% ethanol that can be hard on rubber seals and hoses, in my opinion, I would run straight AV with the marvel oil

Sent from my iPhone using SoCal Jet Boats

I'm thinking the same that's what I ran last time only thing I worry about is availability.. Anyone got advise or suggestions on where and how.

« **Reply #16 on:** February 09, 2016, 09:18:06 PM »

91 with that cam and 10.7:1 is fine. Start at 32 deg timing and check plugs. I bet you'd find 36 deg of timing works too though.

« **Reply #17 on:** February 09, 2016, 09:27:21 PM »

Quote from: Onthenos on February 09, 2016, 09:18:06 PM

91 with that cam and 10.7:1 is fine. Start at 32 deg timing and check plugs. I bet you'd find 36 deg of timing works too though.

That'd be awesome. I just really don't wanna hurt the motor but 10.7:1 doesn't seem like too much compression to me but no professional. What kinda power do you guys think I'm making and opinions on the setup as its new too me.

Sorry man

Trick flow heads ported & polished
Milodon stainless valves
Crane Triple valve springs
HS roller rockers
Engle cam/lifters
Ford motor craft single plane manifold port matched.
Holly 850 but really 1100 now
Eagle billet crank
Eagle H beam rods
JE billet Pistons
MSD billet distributer
MSD 6AL ignition
Holley elec fuel pump

Berkeley 12jg blueprinted
Modded bowl
Bronze mag impeller

« **Reply #18 on:** February 09, 2016, 09:29:48 PM »

I'd say 700-750.

« **Reply #19 on:** February 09, 2016, 09:36:53 PM »

Quote from: Onthenos on February 09, 2016, 09:29:48 PM

I'd say 700-750.

So think I'm safe on 91 pump gas to run all the time cruising and making a pass at wot. Anything you'd change on my setup. Says he thinks it's a b impeller and when I had it out it deff hooks up and gets it and it'll spin at 6,000rpm of course I was only at wot for a few seconds at a time since the motor is new to me

« **Reply #20 on:** February 09, 2016, 09:38:55 PM »

Sounds like a good package to me honestly.

« **Reply #21 on:** February 10, 2016, 05:09:51 AM »

So drop that bitch in the water, drive it like you stole it and post up a video if it. Sounds like she will run angry.

« **Reply #22 on:** February 10, 2016, 05:15:03 AM »

I run half 91 half AV with marvels in my 10.5:1 olds and never have a problem. I stop at Blythe airport on my way in every trip.

Sent from my iPhone using SoCal Jet Boats

« **Reply #23 on:** February 11, 2016, 11:43:54 AM »

Quote from: 77_liberty on February 09, 2016, 09:27:21 PM

That'd be awesome. I just really don't wanna hurt the motor but 10.7:1 doesn't seem like too much compression to me but no professional. What kinda power do you guys think I'm making and opinions on the setup as its new too me.

Sorry man

Trick flow heads ported & polished
Milodon stainless valves
Crane Triple valve springs
HS roller rockers
Engle cam/lifters
Ford motor craft single plane manifold port matched.
Holly 850 but really 1100 now
Eagle billet crank
Eagle H beam rods
JE billet Pistons
MSD billet distributer
MSD 6AL ignition
Holley elec fuel pump

Berkeley 12jg blueprinted
Modded bowl
Bronze mag impeller

My set-up is similar, 508ci, .715 lift and 12:1, 730 hp.
I run AV with marvel. I get my fuel at French Valley Airport in Murrieta.

« **Reply #24 on:** February 11, 2016, 12:14:14 PM »

Quote from: 00 CP on February 11, 2016, 11:43:54 AM

My set-up is similar, 508ci, .715 lift and 12:1, 730 hp.
I run AV with marvel. I get my fuel at French Valley Airport in Murrieta.

gonna have to run 110 when you start spraying her this year 😜

Gimme that BECKY!

77_liberty

Oliver1421

77_liberty

jimpen

77_liberty

jimpen

jimpen

77_liberty

jimpen

77_liberty

Oliver1421

GT Jets

GT Jets

77_liberty

K-034

77_liberty

Onthenos

77_liberty

Onthenos

77_liberty

Onthenos

FordLover

Bunger

00 CP

capogniracing