first blower build couple questions
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first blower build couple questions

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    Senior Member stewvette's Avatar
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    Default first blower build couple questions

    This is my first blower build so i have a couple questions i would apreciate some help with. Im building the 540 bbc for use in my 21 daytona. Probably will not spin it much over 6000. i have a 671 that will run aprox 10% over. I have two Holley 750 dp ill be using.
    1. I see most applications have the carbs sideways. my setup is inline are there pros or cons for either way besides jet access?
    2. My Carbs are not boost referenced, is that good idea to do on a lake boat?
    3. Do most of you guys run a balancer with the blower pulley on the crank? If so which balancer would you recommend.
    4. I have a high rise blower manifold (in pics) that i have never seen before nor can i find a name on. Any info for me, any good??

    Thanks
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    Quote Originally Posted by stewvette View Post
    This is my first blower build so i have a couple questions i would apreciate some help with. Im building the 540 bbc for use in my 21 daytona. Probably will not spin it much over 6000. i have a 671 that will run aprox 10% over. I have two Holley 750 dp ill be using.
    1. I see most applications have the carbs sideways. my setup is inline are there pros or cons for either way besides jet access?
    2. My Carbs are not boost referenced, is that good idea to do on a lake boat?
    3. Do most of you guys run a balancer with the blower pulley on the crank? If so which balancer would you recommend.
    4. I have a high rise blower manifold (in pics) that i have never seen before nor can i find a name on. Any info for me, any good??

    Thanks


    Two therorys on the balancer - I would run one for a lake boat that doesn't see regular tear downs .. My .002
    some say they hub acts as a balancer and absorbs the harmonics .. Like i said for a lake app - Make it bullet proof
    " my carbon footprint is gonna kick your green ass"


    Quote Originally Posted by 396_Ways_To_Spit View Post
    WOWO!!!!! THat has to be the most beautiful crank that Ive ever seen!!!!!!!!!!!!!!!!


    Quote Originally Posted by MAXIMUS View Post
    He has been allowing me to park my equipment in his backyard for a few years now...
    [/SIGPIC]

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    Senior Member wagspe208's Avatar
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    Boy, this is going to get good. You asked many questions that are very controversial or open to personal preference. There will be some pissing and moaning here.
    Carbs... jetting, yes.
    Boost reference... yes.
    Balancer... yes no maybe
    Wags

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    Let me the idiot here hell I dont care ...what the hell is the diff if the bowls are sideways as far as jetting and what is boost reference?

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    Balancer ?? That's what the belts for it absorbs the harmonics better than you think.

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    gn7
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    There is no controversy in his questions Wags.
    Carb adaptor. Pain in the ass to jet. Other than that, very little if any difference.
    Boost reference. On a lake boat...absolutely
    The manifold...appears to be an adator on a tunnel ram. Home made?

    Balancer? Do not even consider running a blown lake boat without one. No one has ever said the hub acts a balancer. There are however, some very misguided people who think the blower belt acts a a damper. Do not believe it. The blower has its own issues it makes the crank live with. No blower ever made life easier on the crank. Get a damper. Top end deal, ATI Super Damper, more of a budget deal, Romac, or Pro Race. All 3 make blower specfic dampers with the pulley bolt pattern in them. No adaptors needed.



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    gn7
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    Quote Originally Posted by pisston in the wind View Post
    Balancer ?? That's what the belts for it absorbs the harmonics better than you think.
    Ah, but does it help with torsional twist. As for harmonics. Why bother with dampers at all. Every car has belts. Don't they absorb the harmonics?



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    Last edited by gn7; 11-23-2010 at 04:26 PM.

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    Quote Originally Posted by gn7 View Post
    Ah, but does it help with torsional twist. As for harmonics. Why bother with dampers at all. Every car has belts. Don't they absorb the harmonics?
    Ya just put a chain coupler there instead. lol

    I agree with GN7 btw so x2
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

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    gn7
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    Quote Originally Posted by mdsheppie View Post
    Let me the idiot here hell I dont care ...what the hell is the diff if the bowls are sideways as far as jetting and what is boost reference?
    When the carbs are sideways, you can remove all the bowls to access the jets. When they are inline, you have to remove one carb to get access to the rear of the front carb, and the front bowl of the rear carb.

    Boost referencing allows the carbs to see the manifold vacuum/pressure, instead of under the carb. Which in a blower deal creates hi vacuum under the carb, and would cause the carb to never open the power valve. When the carn sees the manifold pressure, or low vacuum, the power valve is able to open.



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    Default carbs

    Hey gn7 i was wondering also about the boost reference deal i have always ran a enderle hat but have been thinking about building a blown carbed lake motor, what do they do to the crabs to boost reference them. You run carbs on your boat right

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    Thanks Bob but how can I tell if the carbs were boost referenced mine have no power valves and the guy who made them seems to be a prick and wont answer emails just go easy okay?

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    Senior Member wagspe208's Avatar
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    The boost referencing is for the power valves.

    Also, make damn sure the linkage is 1:1. Don't just bolt on the 1:1 kit and assume its ok. It won't be.
    Progressive linkage on sideways carbs = 4 rich cyls or happy and 4 lean cyls or not happy.
    Wags

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    Personally I am a balancer guy. Had one on my lake jet. Still have it on the PE piece. (cause I was already setup with spacing, pulley, etc).
    Wags

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    BTW, I am not a blower expert or anything like that but... the street pealer I just finished (well, a few month ago) runs its balls off.
    Balancer, boost referenced carbs, sideways mounted, locked advance, 400 -5%. He was at 5 or 6 over and it was so bad the owner was scared. I had him back it down to underdriven. Now he says it is driveable. Before he said it just wanted to run. I don't think he has been to full throttle yet, though. Starts with key turn, he loves it. Said he never knew how great it cold be.
    Good luck.
    Listen to those that know.
    Wags

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