Rectangle Port Dual-plane Intake's??
#11
I have 509's , I am running the Crane big hyd roller cam,( 7 something ) pro 1 heads tricked out by Jim V. and Lightning headers with the Dart single plane intake and they will all day at 600 RPM in gear. Holley HP 950's for carbs.
Before the Crane hyd cam I was running a big solid flat tappet cam. Same results. ( idle quality that is ) ( The Hyd roller is smother )
Before the Crane hyd cam I was running a big solid flat tappet cam. Same results. ( idle quality that is ) ( The Hyd roller is smother )
#12
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i got hydr.roller cam's. i don't know why my builder is so worried about the idle then. everyone else is running a single plane intake it seem's.i think he's trying to give me a nervous brake-down. i'm already a couple week's behind on these thing's and the intake's are the last piece here. everything eles is ready to rock.
#13
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Mine were rectangle ports that were welded up to match the ports of the heads. The floors of the heads were 'wedged' and then ported. they look like a cross between oval and rectangle, but the ports all match.
Tinkerer I have not forgot about the DYNO but Jim has been pretty busy and I decided to tear down my other engine last night and redo it completely. So I might not be going to the dyno till later, if at all. I do want to go when Jim pulls his and I will let you know.
You done with the Toy Box yet??
Jason
Tinkerer I have not forgot about the DYNO but Jim has been pretty busy and I decided to tear down my other engine last night and redo it completely. So I might not be going to the dyno till later, if at all. I do want to go when Jim pulls his and I will let you know.
You done with the Toy Box yet??
Jason
#14
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Idle quality depends alot more on cam choice than single vs. dual plane. If your cam choice is reletively conservative, a smaller single plane like a Dart will idle great at 800rpm. My old 454-420hps came from Merc with single planes, Wiend Xcelleraters and they would idle all day at 800rpms. They had square port heads also.
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Yes again on the cam on idling....the intake is going to have very little on idle quality....low end power...now thats another story....I still feel ovals are the best choice on boats...unless the cubic inches way up there...and even then I have seen some 600 + motors with ovals making some unreal low mid power...right where we need it....Rob
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had both a 850 BG, and my new one which was stolen was a 1050 nickerson stage 5, now going to a custom one from DEAN GELLNER with a intake custom ported. so in 2months we will see I hope if not then more stuff will be changed head work cam.going for 725 to 750 from 670 with the nickerson/ 647with bg merlin heads
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how long can you idle for? we have alot of no-wake zones here on the chain and my builder say's they won't like idleing at 900-1000 rpm with single plane intake on the rect.port heads. this is giving me a headache....or an ulcer. he say's he's seen it enough on the dyno's that the rect.ports don't like idleing at 1000rpm for long with big cams they will load up , snrot, cough, you get my drift. i gotta go with what he think's, i think.
Last edited by AIR TIME; 04-24-2008 at 12:40 AM.
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I have 509's , I am running the Crane big hyd roller cam,( 7 something ) pro 1 heads tricked out by Jim V. and Lightning headers with the Dart single plane intake and they will all day at 600 RPM in gear. Holley HP 950's for carbs.
Before the Crane hyd cam I was running a big solid flat tappet cam. Same results. ( idle quality that is ) ( The Hyd roller is smother )
Before the Crane hyd cam I was running a big solid flat tappet cam. Same results. ( idle quality that is ) ( The Hyd roller is smother )
#20
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i got hydr.roller cam's. i don't know why my builder is so worried about the idle then. everyone else is running a single plane intake it seem's.i think he's trying to give me a nervous brake-down. i'm already a couple week's behind on these thing's and the intake's are the last piece here. everything eles is ready to rock.
Last edited by AIR TIME; 04-24-2008 at 12:42 AM.
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