Blowthru vs/or Drawthru Turbo

Splitdog · Posted: Wed Jan 16, 2019 1:55 pm Post subject: Re: Blowthru vs/or Drawthru Turbo

What cam are you running?
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DerrickfromNC1 · Posted: Wed Jan 16, 2019 2:30 pm Post subject: Re: Blowthru vs/or Drawthru Turbo

Webcam 86b on 112lc with CB 1.4s. Lifters are from Aircooled.net lightweight(pencil thin) units with matching sleeves for the lifter bore and their HD aluminum pushrods.

Planning on upgrading heads when I pull the trigger on the turbo. Also I have both a MSD distributor 6btm box and the CB perf programmable distributor in my parts bin.

Splitdog · Posted: Wed Jan 16, 2019 2:36 pm Post subject: Re: Blowthru vs/or Drawthru Turbo

So you're wanting high RPM?
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FullFender · Samba Member Joined: October 25, 2014 Posts: 647

Splitdog · Posted: Wed Jan 16, 2019 3:07 pm Post subject: Re: Blowthru vs/or Drawthru Turbo

Yup. Over 5000 rpm maybe not.....
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DerrickfromNC1 · Posted: Wed Jan 16, 2019 3:52 pm Post subject: Re: Blowthru vs/or Drawthru Turbo

Splitdog · Posted: Wed Jan 16, 2019 4:06 pm Post subject: Re: Blowthru vs/or Drawthru Turbo

Mine is 240* dur @ .050. Cams seem bigger with a turbo. I drove an exact duplicate of my engine with a 120 cam, and it didn't come on until 3000. Not good for puttin around.
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VdanielW · Posted: Fri Jan 18, 2019 9:17 am Post subject: Re: Blowthru vs/or Drawthru Turbo

My 2276 turbo engine with a w120 pulled to 7500rpm no problem. Probably would have gone further had I allowed it.

FullFender · Samba Member Joined: October 25, 2014 Posts: 647

VdanielW

1.14 4th, 3.88 r/p. Der Transaxle built

Splitdog

Yes, but when did it come on?
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VdanielW

Full boost by 3k using Aj's GT33 turbo. It's a 32 exhaust and a 35 intake.

Splitdog

Do you know what i mean by 'on the cam', 'off the cam'? When did it smooth out and have driveability off boost?
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VdanielW · Posted: Fri Jan 18, 2019 2:40 pm Post subject: Re: Blowthru vs/or Drawthru Turbo

Not sure if you are referring to me, the 7500 pull was at the track- full throttle at all times. With that trans I don't drive it on the street, too high of rpms. My street bug will be getting most of this engine (2276 but with smaller heads) and with its trans gearing (.89 4th & 3.88 r/p) I expecting the same thing I had before my race bug became my race bug- it ran great.
I had been running this set up for a long time on the street (I remember when Aj had your bug in his shop building the header to make sure it fully cleared your deck lid- nice car by the way) and always enjoyed driving it long distances (2hrs on the freeway to get to low bugget). I decided, when the cage went into the car, to rebuild the trans with 1/4 mile gearing and to go to larger valves (originally had 40x35 and went up to 42x37). It was at that point that it started having more issues on street driving with the hickups, flat spots, and loading up at stops, which were not problems before. For racing this wasn't a concern, but now that I'm putting this back in to my street car I'm dropping back down to a smaller valve size (different set of heads). I would totally agree, for street, stick with a smaller cam. LowBugget lbc2 cam is perfect for a street cam. A w110 or even a w100 would be great as well.

Splitdog · Posted: Fri Jan 18, 2019 3:07 pm Post subject: Re: Blowthru vs/or Drawthru Turbo

Yes, I agree. People tend to over-cam a street turbo setup. And thanks for the compliment.
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Howard 111 · Posted: Fri Jan 18, 2019 5:33 pm Post subject: Re: Blowthru vs/or Drawthru Turbo

I run an FK-65 in my street turbo engine. It's rated at 5000, a very mild street cam, but pulls hard to 6000 with the turbo. I love how it runs. I remember reading years ago that for a street turbo cam, you want to keep the overlap at 20 degrees. Mine is dead on 20 degrees.
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DerrickfromNC1 · Posted: Fri Jan 18, 2019 5:45 pm Post subject: Re: Blowthru vs/or Drawthru Turbo

Howard 111 · Posted: Fri Jan 18, 2019 6:11 pm Post subject: Re: Blowthru vs/or Drawthru Turbo

My FK-65 runs 1.4 rockers.
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Splitdog · Last edited by Splitdog on Fri Jan 18, 2019 6:55 pm; edited 1 time in total

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CH³NO²

Z = z² + C

Der Blitzkrieg Kafers

#notacallooker

Splitdog · Last edited by Splitdog on Fri Jan 18, 2019 7:02 pm; edited 3 times in total

My FK 41 I'm running 1.25's. You want to use a cam recommended for 1.4's. They have a smoother ramp.

Derrick, the 86a has 253 duration @.050.
The W120 has 252 @ .050.
I think that is too much for driving casually around town, but that may be different for you. I drove a motor just like mine with a 120 and it didn't come on until 3000 rpm. So it wouldn't be good for cruising at 2000-2500 in my opinion. But it also has to do with runner size, overlap, exhaust size, turbo, etc.
_________________
CH³NO²

Z = z² + C

Der Blitzkrieg Kafers

#notacallooker


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