Issues with Clean Running |
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Issues with Clean Running |
deloreandude86 |
Aug 16 2011, 08:13 PM
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#1
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Austin Burkhardt Group: Members Posts: 61 Joined: 18-August 10 From: Austonio, TX Member No.: 12,068 Region Association: South East States |
Hey all, I'm having some issues with my engine. its a 1.7L Dual Carbed. Everything electrical is brand new, Plugs, wires, distributor, (including points), coil. I believe its getting proper gas flow but it's weird though because it idles fine. If reved and the instantly released it sounds great kicks right up no problem, however if brought up to about 3500-4000 or greater and held, it makes a poping noise and looses rpms. also on take off, give it a couple revs, sounds great, put it in first and take off, it'll throw you back in the seat then it hits about 3000 rpm and starts bogging down, shift to second and its about the same deal. In 3rd it starts to bog down and tops out about 45mph. 4th is really starting to bog and on the road can hit about 50. 5th gear is a notch above chugging it out completely. pedal clear to the floor and its loosing speed, any ideas guys?
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wingnut86 |
Aug 16 2011, 08:25 PM
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#2
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...boola la boo boola boo... Group: Members Posts: 1,053 Joined: 22-April 10 From: South Carolina Member No.: 11,645 Region Association: South East States |
1 Bad gas
2 Carbs 3 Fuel pump ...I had a similar issue with my Pontiac tri-power many years back, the carbs were picky about gas and gave me hell after each rebuild... Hah! And I thought dividing an 8 cylinder in half would be easier (IMG:style_emoticons/default/WTF.gif) |
deloreandude86 |
Aug 16 2011, 08:33 PM
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#3
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Austin Burkhardt Group: Members Posts: 61 Joined: 18-August 10 From: Austonio, TX Member No.: 12,068 Region Association: South East States |
1 Bad gas 2 Carbs 3 Fuel pump ...I had a similar issue with my Pontiac tri-power many years back, the carbs were picky about gas and gave me hell after each rebuild... Hah! And I thought dividing an 8 cylinder in half would be easier (IMG:style_emoticons/default/WTF.gif) Forgot to mention, Carb kit is brand new, along with new low pressure pump, and a cleaned gas tank. Not ruling this out as a problem, just think its still unlikely |
914itis |
Aug 16 2011, 08:41 PM
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#4
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Advanced Member Group: Members Posts: 2,892 Joined: 9-October 10 From: New York City Member No.: 12,256 Region Association: North East States |
I am thinking carb sync/ cross link bar adjustment. I would check the cross link bar to make sure the carbs are getting the same amount of gas at the same time.
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deloreandude86 |
Aug 16 2011, 08:49 PM
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#5
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Austin Burkhardt Group: Members Posts: 61 Joined: 18-August 10 From: Austonio, TX Member No.: 12,068 Region Association: South East States |
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914Mels |
Aug 17 2011, 11:20 AM
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#6
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Member Group: Members Posts: 357 Joined: 20-June 11 From: Santee Member No.: 13,221 Region Association: Southern California |
What kind of air cleaners are you running? What kind of carbs?
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rnellums |
Aug 17 2011, 01:53 PM
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#7
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Professional Enthusiast Group: Members Posts: 1,646 Joined: 26-November 09 From: Littleton, CO Member No.: 11,072 Region Association: Rocky Mountains |
I had problems like this with water in the jets in my webers. I removed and cleaned the jets and the problem went away. It is an easy check.
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underthetire |
Aug 17 2011, 01:58 PM
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#8
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914 Guru Group: Members Posts: 5,062 Joined: 7-October 08 From: Brentwood Member No.: 9,623 Region Association: Northern California |
Valves/valve adjustment. Too tight will cause this.
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deloreandude86 |
Aug 17 2011, 10:43 PM
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#9
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Austin Burkhardt Group: Members Posts: 61 Joined: 18-August 10 From: Austonio, TX Member No.: 12,068 Region Association: South East States |
all great suggestions guys, but i think we resolved that the problem runs deeper. Getting low compression (30) in #3 and about (60) in #4, didn't even bother checking the other 2, engines gonna have to come back down, new seal kit, Took a shortcut and payed for it in the end. (IMG:style_emoticons/default/sad.gif)
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Mike Bellis |
Aug 17 2011, 10:58 PM
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#10
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Resident Electrician Group: Members Posts: 8,346 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None |
I had a similar problem. I ended up being the fuel filter. As fuel velosity increased a large burr from machining would clog the output barb. The engine would die when it reached 3500rpm.
If your compression is that low, you have other issues... (IMG:style_emoticons/default/sad.gif) |
McMark |
Aug 18 2011, 05:23 AM
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#11
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
Check your valve adjustment first. (IMG:style_emoticons/default/wink.gif)
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wingnut86 |
Aug 18 2011, 05:33 AM
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#12
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...boola la boo boola boo... Group: Members Posts: 1,053 Joined: 22-April 10 From: South Carolina Member No.: 11,645 Region Association: South East States |
Agreed w/valve adjustment 1st - easy speasy compared to a reseal 1st.
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Haudiosolutions |
Aug 18 2011, 05:50 AM
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#13
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Member Group: Members Posts: 215 Joined: 19-October 10 From: Sevierville, TN Member No.: 12,284 Region Association: South East States |
I had a very similar problem. Resetting my points gap and timing resolved it completely
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