Cutting grooves in intake manifold?
11-23-06, 07:11 PM
#51
The water/alky injection tends to steam clean engine internals. Has the same effect as Seafoam and similiar products. I have torn down engines that have blown a water seal, and they were spotless inside, not a spec of carbon.
Between running a richer mixture than boingers and oil injection, carbon build up is inevitable. Frequent internal cleaning with Seafoam, etc., goes a long way in maintaining performance.
Fwiw, trying to run a leanburn boosted rotary gets very expensive when mistakes are made.
Between running a richer mixture than boingers and oil injection, carbon build up is inevitable. Frequent internal cleaning with Seafoam, etc., goes a long way in maintaining performance.
Fwiw, trying to run a leanburn boosted rotary gets very expensive when mistakes are made.
11-24-06, 04:41 PM
#53
i'm trying to visualize the path of the mixture and i'm thinking the ideal place would be from the entrance of the curve in the manifold to where the manifold dumps into the runners on the engine. i'm thinking that change in direction might be the prime spot for gasoline to start falling out of suspension. i don't know though.
11-24-06, 07:42 PM
#54
The idea of grooving is to create a boundry layer between the main air flow and the surface. Visualize the boundry layer as a layer of ball bearings for the air flow to ride over. Not only do the 'bearings' provide 'lubrication', they also move along with the air flow at a differential rate. The air flow will also take a path that is the shortest and of the least resistance, i.e., apexing the inside of the curves.
I would imagine that with computer modeling and field testing, a prefered groove pattern could be developed. Fwiw, I would groove the inside of the curve, along with the outside.
I would imagine that with computer modeling and field testing, a prefered groove pattern could be developed. Fwiw, I would groove the inside of the curve, along with the outside.
11-24-06, 08:10 PM
#55
Airflow is my life
Originally Posted by diabolical1
i'm trying to visualize the path of the mixture and i'm thinking the ideal place would be from the entrance of the curve in the manifold to where the manifold dumps into the runners on the engine. i'm thinking that change in direction might be the prime spot for gasoline to start falling out of suspension. i don't know though.
11-25-06, 10:26 AM
#56
ok. i have my carb off waiting for new jets to get here. id like to do this while its all apart. i just dont want to mess up a RB manifold, so i want to do it right the first time. i have a Rb 2-piece sidedraft manifold. heres some questions i have:
do i need to put grooves down the entire manifold? thatd be easily achievable with a 2 piece.
how deep should they be?
no specific pattern? just dont over do it or under do it? basically personaly judgement?
do i need to put grooves down the entire manifold? thatd be easily achievable with a 2 piece.
how deep should they be?
no specific pattern? just dont over do it or under do it? basically personaly judgement?
12-10-06, 03:06 AM
#57
MPG report. Well I can't say I'm impressed with the MPG readings. I've been beating on her a little more than usual lately because of the ported intake bigger secondary jets and new tires. But I'm averaging around 17mpg. I was about 20 before. I'll try and tone it down a bit but it's hard! She just loves speeding through the corners with the new shoes! 
I'm sure the 10-20 degree temps we have been having here in KS don't help any either. But So far I haven't noticed and noticeable gain in MPG if anything maybe a little drop.
I was thinking of opening up the primary air bleed jets a bit to lean things out a little. Although I'm reluctant without having a WB 02 setup on it.
I'm sure the 10-20 degree temps we have been having here in KS don't help any either. But So far I haven't noticed and noticeable gain in MPG if anything maybe a little drop.
I was thinking of opening up the primary air bleed jets a bit to lean things out a little. Although I'm reluctant without having a WB 02 setup on it.
12-10-06, 10:17 AM
#58
Originally Posted by vxturboxv
MPG report. Well I can't say I'm impressed with the MPG readings. I've been beating on her a little more than usual lately because of the ported intake bigger secondary jets and new tires. But I'm averaging around 17mpg. I was about 20 before. I'll try and tone it down a bit but it's hard! She just loves speeding through the corners with the new shoes!
12-10-06, 01:51 PM
#59
Originally Posted by diabolical1
not for nothing, but isn't it your data going to be a bit contaminated simply because you've changed two related variables? your MPG is going to be affected by your larger jets in addition to your intake changes. also, as you mentioned, your driving has gotten more aggressive, too (with no sight of reform).
If I can manage to keep my foot out of it I don't think the jet sizes will matter. I only opened up the secondary jets and only a tiny bit maybe 5% total. And I didn't port the primary runners on the manifold either. So Technically if I don't open my VAC secondaries I should get close to the same flow. I did remove the little butterfly valve in there though.
We'll see. I'm really thinking hard about swapping the WB gauge on my race RX over to the daily to play with air bleeds.
We'll see!
04-22-07, 10:07 PM
#60
Bringing back an old thread... Just went on a big road trip so I watched the gas mileage closely. I do have a RE header now. Other than that no changes. I managed 25mpg AVG on the highway. Not to bad alot of room for improvement. I still believe these cars run really rich at cruise. Maybe it's necessary for lubrication and cooling?
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