2332 CB2289 RPM question

[deadkombi]

Hi Guys
I've recently built a 2332 with CB2289, which is supposed to be similar to FK87, and it doesn't rev as much as I was expecting. My last motor with a W130 easily revved to 7500, so was expecting similar from this. Combo is:
84 CB crank
5500 CB rods
94mm AA slipper skirt forged pistons
Superpro heads 44x37, 650 springs
Match ported big beef manifolds
Pauter 1.4 rockers
13.5 pound German flywheel
10.7:1 compression
48 IDA's, 42 vents, F2, 175 main, 65 idles, 200 air
AF gauge is around 11 at full throttle
1 5/8 bugpack header 2 1/4 straight through muffler
Close ratio gears

It goes hard, with loads of power, but seems to struggle to rev over 7000rpm. No popping etc from carbs, they seem smooth. Is this right for that cam, or is my exhaust too small/flywheel too heavy???

Appreciate your wisdom and experience, regards Paul

[Boolean]

You need a bigger exhaust. 1 3/4 will let it breathe.
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I strive for perfection. Excellence will not be tolerated!
Build thread here:
http://www.thesamba.com/vw/forum/viewtopic.php?t=529379

[madmike]

X2 on what he said
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'Black Ice'Drag Buggy 'Turbo'
Rail Buggy 1915 turbo
76 Drag/Street bug 2180cc 'Turbo' 11:85 @113 mph"If I go any faster I'll burn up the Hamster" ,gets 28 mpg. also 10/09/22 11.90 @115 mph
"If I'm ever on Life Support,UNPLUG Me, Then Plug me back In see if that Works"

[jpaull]

Did you run the 1 5/8 on your last engine also?

Nice combo on your new engine! Good to hear back from you!!
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[email protected] MPH 1/4 Mile & 8.1 @ 83.7MPH in 1/8 Mile with Mild Type 1 VW Mag Case 2234cc commuter engine in stock weight bug w/only .491 total lift(CB2292 Cam), 42x37 heads, 48idf's, Street tires, Belt on, Mufflers, Pump gas, video of the run here: https://youtu.be/M3SPqMOKAOg

Transmission by MCMScott:
Rhino case, Klinkenberg 4.12, Superdiff, 002 mainshaft with 091 first idler. Weddle 1.48 Third & 1.14 Fourth.

[deadkombi]

Last motor ran a 1 5/8, same system.

[slalombuggy]

My one engine is almost part for part identical to yours including pistons and rockers. I have an 1 3/4 exhaust and 51 EPC carbs and yep, at 7000rpm it pretty much shuts off

brad

[66brm]

Time for boost Paul
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[[email protected]]

What type of fuel pump are you running? I had an issue with a friends 2276 with an FK 10, and 44 HPMX's running one of those little carter rotory pumps out of fuel. It ran fine around town, or simple play, but it flat out emptied the carbs around 1000 ft at the track. After installing a larger pump, the jetting had to be reduced in size from over compensating for the lack of fuel with the smaller pump.

[deadkombi]

Cheers Brad, I saw your engine build combo when I was researching parts.

BRM, turbo with that compression would be interesting.

Yep, carter rotary pump.

How many RPM are people getting out of the CB2289?

I guess the 1/4 mile will tell the tale.

[maui]

Maybe retard timing couple and f7 and smaller main might help.

[Alstrup]

Was the previus engine the same size? I think not.

Yes, larger header, and lean that sucker out. 11-1 AFR is WAY too rich. That alone will kill upper end power with up to 10 hp.

- Actually, replace the header first. Then the engine might want that much fuel because it can now breathe.

T

[mark tucker]

[deadkombi]

Thanks a lot, appreciate the help. All the best.

[deadkombi]

I'm back, and ready for an exhaust upgrade. After I last posted I upgraded the fuel pump and gave it 3.5 PSI of pressure and old girl ran a 12.3 at 109MPH. Was very happy with the performance. It did however blow out 2 exhaust gaskets.
So question is what size exhaust? Was thinking of a Stage 2 WASP set up. Thoughts please. Is stage 1 or 2 best. Don't really drive it on the street very often.

Here's a photo form the nostalgia drag racing event in Western Australia. Thanks for your help and advice. Cheers Paul.

[madmike]

1 3/4"
_________________
'Black Ice'Drag Buggy 'Turbo'
Rail Buggy 1915 turbo
76 Drag/Street bug 2180cc 'Turbo' 11:85 @113 mph"If I go any faster I'll burn up the Hamster" ,gets 28 mpg. also 10/09/22 11.90 @115 mph
"If I'm ever on Life Support,UNPLUG Me, Then Plug me back In see if that Works"

[[email protected]]

Thats awesome! It's always fun to come back from the ticket booth with an unusually fast VW, to a crowd of naive onlookers that can't fathom a VW going faster than 15 seconds in a 1/4 mile. What fuel pump/lines did you end up with? neil68 has a lot of experience with JPM stuff. I'm pretty sure he went with a stage 2 Wasp. Maybe he will add to the post, or you could try contacting JPM directly, and see what they recommend.

[deadkombi]

I have read Neil68's threads and he has a similar engine. Fuel lines are 5/16 or 8mm.

[[email protected]]

I would venture to say you could benefit from a 3/8's, or even larger fuel line. What pump did you end up going with? If it was the little rotary Carter, you may also benefit from a larger volume pump.

[deadkombi]

Carter pump from a V8. The AF gauge is still reading a bit rich 11.8 wide open throttle at the end of the track, so doesn't seem to be running out of fuel. Torben thinks the bigger header will sort the richness out.

Cheers.

[neil68]

I have a very similar engine: 2332 cc, 274-degree Raptor cam (same duration, but a bit more lift than your CB2289) and went with the Wasp Stage 2 header. It starts with 1.625" pipe at the exhaust port, then quickly increases to 1.875" and then 2". It's rated for 220-290 HP. I drive around the city all the time and it's still smooth. Engine pulls nicely to the 8200 rpm rev limiter, but I'm not sure if it's making any more power past 7000...it just works with my shift points at the track, to push to 8000.

I recently changed from the stock fuel pump & lines to a Carter Rotary and -6 lines, but haven't run any faster in the 1/4-mile. I do need to get on the Dynojet and tune this engine properly!

I have similar IDA jetting: 175-185 main, 210-220 air (2,200 and 3,600 ft elevation), 65 idle, 3 mm needle valve and 44 Raptor vents. I just installed the Raptor power jets, as my next experiment.
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Neil.

Der Kleiner Rennwagens
68 Beetle 2332 cc, 204 WHP
12.5 seconds @ 107 mph
Dynojet Test: https://www.youtube.com/watch?v=M9B_H3eklAo