Blown gas 522 uneven cylinder temps
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Blown gas 522 uneven cylinder temps

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    Default Blown gas 522 uneven cylinder temps

    Have a BBC 522 with Mooneyham 1071 on gasoline. Gen 5 GM block, Brodix BB2 heads, Felpro MLS #1075-1 head gaskets and BDS 8027 competition blower intake The intake manifold has 2 outlets at front of manifold, 1 on either side. I T'd them together for exit water, however seems to be a cooling issue. The cyl. head for odd numbered cylinders seems to cool nicely, however the even numbered cylinders head is burning hot. Can somebody enlighten me on what could be causing 1 hot head & 1 cold head?

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    Some guy obnoxious001's Avatar
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    Quote Originally Posted by Cougarcanuck View Post
    Have a BBC 522 with Mooneyham 1071 on gasoline. Gen 5 GM block, Brodix BB2 heads, Felpro MLS #1075-1 head gaskets and BDS 8027 competition blower intake The intake manifold has 2 outlets at front of manifold, 1 on either side. I T'd them together for exit water, however seems to be a cooling issue. The cyl. head for odd numbered cylinders seems to cool nicely, however the even numbered cylinders head is burning hot. Can somebody enlighten me on what could be causing 1 hot head & 1 cold head?
    Got to guess there is a pressure imbalance, keeping water from flowing on the one side. Rig a temporary deal with two outlet lines, taped over the side if necessary. Maybe photos of your tee arrangement,, ran into something like that on a comp jet race boat I built an engine for, made a few changes and it was fine. What feeds the water to the block?

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    I have never been a fan of cast t's. What I made was a 5/8" line into two 1/2" lines to try and make the flow as even as possible.
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    Quote Originally Posted by obnoxious001 View Post
    Got to guess there is a pressure imbalance, keeping water from flowing on the one side. Rig a temporary deal with two outlet lines, taped over the side if necessary. Maybe photos of your tee arrangement,, ran into something like that on a comp jet race boat I built an engine for, made a few changes and it was fine. What feeds the water to the block?
    .........
    The T arrangement is quite basic. There are 2 water outlets at the front of the intake where I believe water would exit the engine. I simply used a#10 AN T to join the 2 together, then a little further down the line just after the junction I put a second AN T in so that 1 hose feeds some water to inject headers and the other hose exits

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    Quote Originally Posted by Cougarcanuck View Post
    .........
    The T arrangement is quite basic. There are 2 water outlets at the front of the intake where I believe water would exit the engine. I simply used a#10 AN T to join the 2 together, then a little further down the line just after the junction I put a second AN T in so that 1 hose feeds some water to inject headers and the other hose exits
    OK, and what I am saying is temporarily change that to see if that is the issue, the tee will be restrictive, and the side of the engine with more inlet pressure will win out.

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    Senior Member LiquidDan's Avatar
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    Stupid question...Have you swapped the gauges?
    Originally Posted by gn7 "Stick to making the worlds best engine stand."

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    Senior Member wagspe208's Avatar
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    Let me guess.... it is a carb piece with carbs mounted sideways....
    Wags

    I have been there... done that... I have preached on it.... but what do I know...
    I will post the answer later tonight if no one figures it out. I literally had a BG piece in a jet boat...Mooneyham 10-71.... bds manifold.... so....

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    Quote Originally Posted by wagspe208 View Post
    Let me guess.... it is a carb piece with carbs mounted sideways....
    Wags

    I have been there... done that... I have preached on it.... but what do I know...
    I will post the answer later tonight if no one figures it out. I literally had a BG piece in a jet boat...Mooneyham 10-71.... bds manifold.... so....
    I had a pump gas tunnel ram engine on the dyno once with some "pro built" carbs specifically for that engine that picked up 140 hp with a simple jet change, so I hear what you are saying, but without seeing photos of plumbing, still say that is a possibility.

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    Quote Originally Posted by wagspe208 View Post
    Let me guess.... it is a carb piece with carbs mounted sideways....
    Wags

    I have been there... done that... I have preached on it.... but what do I know...
    I will post the answer later tonight if no one figures it out. I literally had a BG piece in a jet boat...Mooneyham 10-71.... bds manifold.... so....
    ...........
    Bingo... Exactly. Two 850 Holley's sideways. Wow I'm excited to hear the rest of the story. I am exiting the water out both sides of the BDS intake as there is no thermostat housing provision. The exit hole on the even (hot) side has a AN10 90 degree fitting sending the water to the AN 10 T about 6 inches away where the other water exit is on the manifold. Water leaves the intake manifold from the Odd nunbered side straight to the T. It now has t make a 90 degree turn inside the T as is joins up with the water leaving the other side. Both sides now joined at the . From the T... water flows to another T to feed the header injection T valve. (I also put a gate valve in that line before the Bassett T-valve so I can run no haeder water if desired). Obviously the rest of the water exits out the transom

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    Quote Originally Posted by obnoxious001 View Post
    I had a pump gas tunnel ram engine on the dyno once with some "pro built" carbs specifically for that engine that picked up 140 hp with a simple jet change, so I hear what you are saying, but without seeing photos of plumbing, still say that is a possibility.
    ........
    Darn... Wish I could take pic's but boat is now 300 mile away. Long drive yesterday.

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    Quote Originally Posted by obnoxious001 View Post
    Got to guess there is a pressure imbalance, keeping water from flowing on the one side. Rig a temporary deal with two outlet lines, taped over the side if necessary. Maybe photos of your tee arrangement,, ran into something like that on a comp jet race boat I built an engine for, made a few changes and it was fine. What feeds the water to the block?
    ......
    Good idea. I'll try that this weekend. We run a Cam driven Magnaflo pump with identical plumbing on both pump outlets and it squirts in both water pump holes at front of the block. I run a gate valve in the pump inlet hose to control how much water I feed the Magnaflo pump. That in turn allows control of the engine temp same as my old jet boat.

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    Quote Originally Posted by LiquidDan View Post
    Stupid question...Have you swapped the gauges?
    No gauges on the heads, just 1 Autometer electric. Just noticed with my hand that 1 head is warm & I can hardly touch the other due to heat. Big time different

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    Quote Originally Posted by Cougarcanuck View Post
    ...........
    Bingo... Exactly. Two 850 Holley's sideways. Wow I'm excited to hear the rest of the story. I am exiting the water out both sides of the BDS intake as there is no thermostat housing provision. The exit hole on the even (hot) side has a AN10 90 degree fitting sending the water to the AN 10 T about 6 inches away where the other water exit is on the manifold. Water leaves the intake manifold from the Odd nunbered side straight to the T. It now has t make a 90 degree turn inside the T as is joins up with the water leaving the other side. Both sides now joined at the . From the T... water flows to another T to feed the header injection T valve. (I also put a gate valve in that line before the Bassett T-valve so I can run no haeder water if desired). Obviously the rest of the water exits out the transom
    The 90 will be your restriction. The odd side having the straight fitting is almost certainly the answer in my mind. Exactly the same type situation on the Comp Jet engine I mentioned above.

    Certainly does not hurt to check jets in carbs, they should be squared up to make both sides even

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    So, you may have a water imbalance. You may have different temp issues due to temp pickup location...
    But I would BET, you DO have progressive linkage on your carbs. They all do.
    SO, when at less than 1/2 throttle you have more fuel to 1357 than you do 2468.... so 1357 is fat and "cold"... 2468 is lean and "hot". (as primaries open before secondaries) I only know as it was passed to me... yup... sure enough... 4 plugs fat as fuck, 4 lean. Your plugs will verify this.... but only at partial throttle... I know.. can of worms... but HUGE DIFFERENCE.
    So, buy 1:1 linkage arms..... square jets... no power valve UNLESS boost referenced (ON ALL 4 METERING BLOCKS).... and have fun.
    I am no genius... I LITERALLY HAD THIS ISSUE.
    Wags
    These guys are sharp as hell... they know a lot of shit... but... I am telling you...
    AND..... the "blower mixes all it up and evens the fuel charge" are full of shit. YOUR intake has a pent roof.... the rotors screw fuel outside then to center at bottom.. I don't know what yo have... but I assume you have a moooneyham river racer blower.. nice pieces.. full open bottom....
    With that all being said... I only have 7 1/2 fingers.
    Wags
    Last edited by wagspe208; 07-25-2016 at 09:51 PM.

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