Comp CS268XFI HR13 Reversion in SBC 383
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Last edited by gobirds; 04-27-2020 at 06:46 AM.
#32
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Many thing can contribute to water reversion.
Topic of cid came up. More cid's pulls more air, no ? Since the anwser is yes, it can also pull more water in the exhaust too.
During ATDC of overlap, both valves are open and the piston is going down Air/fuel from intake and exhaust/water/air are all trying to fill the increasing void left by the piston going down. Larger this void is, the more the atmosphere tried to fill it. Remember, again, during overlap the atmosphere can enter from the exhaust too.
So, as we know, cam overlap, internal exhaust design, it's rate of fall, where water is introduced to the exhaust stream, intake manifold design, cyl head design, engine rpm, and etc,etc all contribute to how much exhaust reversion happens.
Topic of cid came up. More cid's pulls more air, no ? Since the anwser is yes, it can also pull more water in the exhaust too.
During ATDC of overlap, both valves are open and the piston is going down Air/fuel from intake and exhaust/water/air are all trying to fill the increasing void left by the piston going down. Larger this void is, the more the atmosphere tried to fill it. Remember, again, during overlap the atmosphere can enter from the exhaust too.
So, as we know, cam overlap, internal exhaust design, it's rate of fall, where water is introduced to the exhaust stream, intake manifold design, cyl head design, engine rpm, and etc,etc all contribute to how much exhaust reversion happens.
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Many thing can contribute to water reversion.
Topic of cid came up. More cid's pulls more air, no ? Since the anwser is yes, it can also pull more water in the exhaust too.
During ATDC of overlap, both valves are open and the piston is going down Air/fuel from intake and exhaust/water/air are all trying to fill the increasing void left by the piston going down. Larger this void is, the more the atmosphere tried to fill it. Remember, again, during overlap the atmosphere can enter from the exhaust too.
So, as we know, cam overlap, internal exhaust design, it's rate of fall, where water is introduced to the exhaust stream, intake manifold design, cyl head design, engine rpm, and etc,etc all contribute to how much exhaust reversion happens.
Topic of cid came up. More cid's pulls more air, no ? Since the anwser is yes, it can also pull more water in the exhaust too.
During ATDC of overlap, both valves are open and the piston is going down Air/fuel from intake and exhaust/water/air are all trying to fill the increasing void left by the piston going down. Larger this void is, the more the atmosphere tried to fill it. Remember, again, during overlap the atmosphere can enter from the exhaust too.
So, as we know, cam overlap, internal exhaust design, it's rate of fall, where water is introduced to the exhaust stream, intake manifold design, cyl head design, engine rpm, and etc,etc all contribute to how much exhaust reversion happens.
#34
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You shouldn't of need dry tails though. Not with a cam that made 300hp in a 350, unless it was some dumb cam like the GM 290hp/350 cam.
Something else was probably fubared.
Something else was probably fubared.
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grind # CS xm270hr-12. It also had the intake off his vortec motor on it also. Only things different from when I ran motor last summer was cam,carb and intake.and of course the exhaust both the cams I tried were both smaller than what I was running in it. The cam I was running went in to my new build
Last edited by gobirds; 04-27-2020 at 03:32 PM.
#36
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I can't follow your typing and I live in the dirt, so I'm used to bad english. LOL.
I thought you said 300hp cam ?
The XM270hr-12 has been used in a bazzillion marine 350's and 383's. Cam of choice actually for really good, but nothing wild, performance. Yes, exhaust needs to have inner pipe extended a bit. Tons of threads on this.
I thought you said 300hp cam ?
The XM270hr-12 has been used in a bazzillion marine 350's and 383's. Cam of choice actually for really good, but nothing wild, performance. Yes, exhaust needs to have inner pipe extended a bit. Tons of threads on this.
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I can't follow your typing and I live in the dirt, so I'm used to bad english. LOL.
I thought you said 300hp cam ?
The XM270hr-12 has been used in a bazzillion marine 350's and 383's. Cam of choice actually for really good, but nothing wild, performance. Yes, exhaust needs to have inner pipe extended a bit. Tons of threads on this.
I thought you said 300hp cam ?
The XM270hr-12 has been used in a bazzillion marine 350's and 383's. Cam of choice actually for really good, but nothing wild, performance. Yes, exhaust needs to have inner pipe extended a bit. Tons of threads on this.