Engine wont start - Saxperience

adamhighfield · 22nd May 2007, 21:25

I have just rebuilt my engine using high comp pistons, piper bp300 cams, throttle bodies, GMC 420cc injectors, kms with wideband etc. But it wont start,
Whan i turn it over it spits flames through my trumpets (from tbs), just keeps turning over and over and over. Tried it with jump leads from another car so battery isnt flat, havent got a clue what it could be!!
Any ideas???

BENSAX3 · 22nd May 2007, 21:48

what noise is it making, spark plugs ok tried cxleaning them/ replacing them, seems as though fuel is getting there as it is spitting flames, imobiliser on???

adamhighfield · 22nd May 2007, 21:56

defo fuel & spark, must be 2 get flames! Spark plugs are new. Has the KMS ecu got an immobiliser bit? Dont think it could have could it?

adamhighfield · 22nd May 2007, 21:57

its just making the noise it makes when a car turns over with some bangs when it spits flames

strachan · 22nd May 2007, 22:03

hello mate sounds like the timing is out it wont be immobiliser because that will cut spark

adamhighfield · 22nd May 2007, 22:04

could it be 180 degrees out?

Ratty · 22nd May 2007, 22:06

does sound like your timings out mate, have you set the timing correct for your new cams, e.g. if you have used standard timing marks then its probably wrong, need to make sure its corrrect, also what startup map do you have.

adamhighfield · 22nd May 2007, 22:08

john from gmc sent me a map that was the closest he had. How do i find out about the timing? I have Piper vernier pulleys 2.

strachan · 22nd May 2007, 22:12

yeah it could be because its opening the inlet valves but the exhaust vales aint opening up at the rite time hence popin out the throttle bodies

adamhighfield · 22nd May 2007, 22:14

ok, will have a look at the timing again tomorrow, where can i find the info for the cams and timing?

Ratty · 22nd May 2007, 22:17

should have came with the cams, you should also have a cam disc or use a dial gauge to dial in the cams, but if you have set it to standard markings and its a 300 degree cam then you better hope you havnt bent any valves, whoever supplied the cam should be able to supply you with the timing setup e.g. 14degress before TDC etc.

strachan · 22nd May 2007, 22:18

get on top dead centre firing on number one cylinder and check the base markings on the cams and set pullys to "0" play with the setting when you get it running also check you crank sensor is picking up a good trigger

adamhighfield · 22nd May 2007, 22:19

it hasnt bent any valves as i turned it over with a socket before i did it with the key & it turned over fine then. Will have a look on the piper website, i have a timing disc actually come to think of it.