73 Thing stock 1600 sluggish or gearing

[speedracer89]

Hello,

I am working on a 73 VW thing with stock 1600.

Following parts have been replaced and are new

Fuel pump
Plugs
Wires
Pertronix electronic SVDA distributor
EMPI 34pic3 carb

So I have to motor timed to 7.5 BTC Running a Main 130 Idle Jet 60 Idle is around 870-900.

I am not sure if what I am about to mention is even a issue for the thing.

So first I will mention the engine is idling great hit the throttle no flat spots.

When I start off and shift through the gears all the gears feel great, This is the possible issue when I let off in 2nd or 3rd gear then hit the throttle again the vehicle will feel slightly sluggish at lower RPM and feels a lot better as the RPM's build.

I am starting to think this is how the thing is geared because I have tried the following option.

127.5 main with 55 idle
127.5 main with 60 idle
130 main with 55 idle
130 main with 60 idle

130 main with 60 idle seems to be the best option but all of the above option pretty have the same symptoms as I mentioned. This is why I think is is how the thing is geared.

I have a bug that doesn't act like that but those transaxles have a different gear ratio.

Any thoughts from anyone? Is an issue that I should look deeper into? If so any solutions?

[Matt Wilson]

You might check your timing dynamically and follow the procedure for the SVDA, rather than a static setting, before messing with carburetor jets.
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1972 Standard Beetle
1969 Baja Beetle

[speedracer89]

[74 Thing]

Post a photo of your engine.

What is the total advance set at with the vac line disconnected an plugged at the carb?

[speedracer89]

[speedracer89]

[speedracer89]

Also seems to do the symptoms above when I let off in 2nd or 3rd and try to do WOT. If I do partial throttle it won’t do it.

[Wildthings]

Got any prior history we should know? Why did you replace the carb? These rigs were pretty pathetic when new, mine runs way better with a worn out rebuild than my first one ran from the showroom floor.

[speedracer89]

[Matt Wilson]

You may try a little more advance like 32deg BTDC with vacuum plugged. Last time you adjusted your valves?
_________________
1972 Standard Beetle
1969 Baja Beetle

[RWK]

I believe some if not all of the original engines were low compression, dished pistons.
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73 Type 181
63 Type 113
63 Type 261- 428 071
62 Type 241-378 025 178 530

[speedracer89]

[Wildthings]

Maybe go with 132.5 main jets and see if the power picks up. I wouldn't go outside of the recommended timing range.

[kpf]

Do you have the same carburetor and distributor in your bug? If not, try swapping the bug distributor into the thing.

I used an aftermarket SVDA distributor for a while and the advance curves must have been different from that of Bosch distributors because it produced noticeably less torque at low rpm than my Bosch DVDA.

Gearing will affect the torque across the rpm range, not only at low rpm.
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1971 Super Beetle

[speedracer89]

[Hot Rod Harp]

I have a stock 1600 DP AM022708 case with a Solex 34PICT3 and a DVDA,
timed to 5*ATDC with vacuum hoses on. Runs good.

_________________
74 Thing 1600DP
76 Westfalia 2.0L FI
69 Beetle 1500SP sold
88 Goldwing GL1500/6 sold


RinTinTin in Waldorf Astoria 1956

[Wildthings]