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1955 build help
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stormy56
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PostPosted: Thu Jul 22, 2021 3:33 pm    Post subject: 1955 build help Reply with quote

Hi guys, I’m looking for some help choosing heads and camshaft for my engine build, important specs as follows

Mag case, full flowed
76mm DPR crank
Lightened flywheel
5.5” cb rods
90.5 mahles
1 5/8” merged exhaust
IDAs with 35 vents

Going in an oval beetle with a AT code IRS trans
195/60 15’s

The car will be a weekend hot rod, not a daily driver

I think either cb panchitos or wedge ports will work for what I want, but will the valves in the panchitos be too small?

And I like the look of the web 163, I want a wide rev range, will it be enough cam?

Cheers
Evan
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DerrickfromNC1
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PostPosted: Thu Jul 22, 2021 4:15 pm    Post subject: Re: 1955 build help Reply with quote

I thought the Panchitos might be too small for my 2332 until I saw this build sheet from CBs website. CB has installed the Panchitos in several 2332 motors with results like this:

2332cc EFI
September 20th, 2018

184 HP @ 5600rpm
192 ft/lbs of Torque @ 4800rpm
Features:
10:1 Compression
#1673 Panchito 044's (40 x 35.5) 94 Bore
#1706 Ultra Wide Glide Sump (4 Quart)
#2300 Eagle Drag Race Camshaft (Engine Builder Special)
#1685 CB Super Stock 1.25:1 Rocker Arms
#9200 MST Billet Valve Covers - Black Anodized
#1771 Oil Filler Breather Box Kit
48mm Throttle Bodies
Gen4 EFI System
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Alstrup
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PostPosted: Thu Jul 22, 2021 4:42 pm    Post subject: Re: 1955 build help Reply with quote

stormy56 wrote:
Hi guys, I’m looking for some help choosing heads and camshaft for my engine build, important specs as follows

Mag case, full flowed
76mm DPR crank
Lightened flywheel
5.5” cb rods
90.5 mahles
1 5/8” merged exhaust
IDAs with 35 vents

Going in an oval beetle with a AT code IRS trans
195/60 15’s

The car will be a weekend hot rod, not a daily driver

I think either cb panchitos or wedge ports will work for what I want, but will the valves in the panchitos be too small?

And I like the look of the web 163, I want a wide rev range, will it be enough cam?

Cheers
Evan

As long as it is on paper we can change things easily.
Such an engine with the P heads and the 163 cam could be a very nice driver, - with only a 1½" merge header. It can be very powerfull for its size, but a warrior,,,, no.
If you want a warrior you need to step up on the cam. I´m thinking CB 2288, maybe even the Web 86B. Then you can exploit the 1 5/8" header.
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stormy56
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PostPosted: Thu Jul 22, 2021 5:39 pm    Post subject: Re: 1955 build help Reply with quote

Thanks, good info

I already have the case, crank, flywheel, rods, p’s and c’s and carbs

My next purchases will be valve train/exhaust

The cam was my biggest worry, 86b with panchitos sounds good
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Dan Ruddock
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PostPosted: Thu Jul 22, 2021 6:27 pm    Post subject: Re: 1955 build help Reply with quote

The 86b is hard to get right now as there is a blank shortage. I do have one in stock.
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stormy56
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PostPosted: Fri Jul 23, 2021 2:25 pm    Post subject: Re: 1955 build help Reply with quote

After a little research it looks like an 86b is more suited to mini wedge ports?
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Dan Ruddock
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PostPosted: Fri Jul 23, 2021 2:34 pm    Post subject: Re: 1955 build help Reply with quote

stormy56 wrote:
After a little research it looks like an 86b is more suited to mini wedge ports?


Who is saying that?
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stormy56
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PostPosted: Fri Jul 23, 2021 2:49 pm    Post subject: Re: 1955 build help Reply with quote

Dan Ruddock wrote:
stormy56 wrote:
After a little research it looks like an 86b is more suited to mini wedge ports?


Who is saying that?


I found a few posts on here saying the port volume is too high for the 86b and they perform poorly at low rpm?

Can’t find the post now Rolling Eyes
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Dan Ruddock
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PostPosted: Fri Jul 23, 2021 3:02 pm    Post subject: Re: 1955 build help Reply with quote

stormy56 wrote:
Dan Ruddock wrote:
stormy56 wrote:
After a little research it looks like an 86b is more suited to mini wedge ports?


Who is saying that?


I found a few posts on here saying the port volume is too high for the 86b and they perform poorly at low rpm?

Can’t find the post now Rolling Eyes


All depends on what type of powerband you want. The panchitos will not have too much port volume and they will run cooler than the mini wedge. Me? I would chose Tims stage one heads.
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stormy56
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PostPosted: Fri Jul 23, 2021 3:20 pm    Post subject: Re: 1955 build help Reply with quote

Dan Ruddock wrote:
stormy56 wrote:
Dan Ruddock wrote:
stormy56 wrote:
After a little research it looks like an 86b is more suited to mini wedge ports?


Who is saying that?


I found a few posts on here saying the port volume is too high for the 86b and they perform poorly at low rpm?

Can’t find the post now Rolling Eyes


All depends on what type of powerband you want. The panchitos will not have too much port volume and they will run cooler than the mini wedge. Me? I would chose Tims stage one heads.


And I’m assuming the mini wedges will perform better at higher rpms?

My aim is for a rev range between 3000~6500

And I’d like a CR around 9.5/1
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Dan Ruddock
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PostPosted: Fri Jul 23, 2021 3:59 pm    Post subject: Re: 1955 build help Reply with quote

Yes mini wedges would have more top and less low end than panchitos.

Yea, Panchitos and the 86b will give you the powerband you want. The first stroker I built back in 1978 was the same bore and stroke as yours. My heads were bigger than panchitos but I had less cam than the 86b and It was done at 6500. The cam was a web 118 with 1.25 autocraft rockers. I would not go any bigger than 40 X 35.5 Heads.

Dan
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stormy56
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PostPosted: Fri Jul 23, 2021 4:21 pm    Post subject: Re: 1955 build help Reply with quote

Cool thanks, I’ll be in touch about the cam
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Brian_e
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PostPosted: Fri Jul 23, 2021 9:07 pm    Post subject: Re: 1955 build help Reply with quote

If the carbs and manifolds are right, a 40mm valve with a correct 88-89% throat (which panchitos have) will allow a 1955cc to rev to 7022rpm.

A 42mm valve on the same engine with a slightly larger 90% throat (which I believe the bigger CNC CB heads have, will allow the 1955cc to rev to 7894rpm.

Too large of a valve make for too large of a port. Too large of a port kills bottom end power because of the slow airspeed.

A cam in the 86b, FK8, cb2288, w125 would be great in this engine.

I have a few brand new FK8’s on the shelf if you decide to go that route.

Brian
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modok
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PostPosted: Fri Jul 23, 2021 9:57 pm    Post subject: Re: 1955 build help Reply with quote

I agree Very Happy
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stormy56
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PostPosted: Fri Jul 23, 2021 11:25 pm    Post subject: Re: 1955 build help Reply with quote

Thanks for that info Brian, I think you’ve all helped me solve my problem, so the final parts to my recipe are;

CNC’d panchitos
Web 86b
CB lightweight lifters
ACN pushrods
1.4 Scat rockers
CB straight cut cam gears

Done?
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