Dolomite sprint

jeffremj · Postby **jeffremj** » 08 May 2010 23:22

<blockquote id="quote">quote:<hr height="1" noshade id="quote">..... and a mapped ignition system. <hr height="1" noshade id="quote"></blockquote id="quote">Been there, done that, have the tee shirt:

http://www.btinternet.com/~triumph/edis.htm - missing pictures now restored!

http://www.autosportlabs.org/viewtopic.php?t=756 - my TR7 16V

http://www.autosportlabs.org/viewtopic.php?t=1270 - my TR7 V8

jeffremj · Postby **jeffremj** » 09 May 2010 21:10

<blockquote id="quote">quote:<hr height="1" noshade id="quote"><blockquote id="quote">quote:<hr height="1" noshade id="quote">Thinking of a way to get around the flatspot @ 3000 rpm ...<hr height="1" noshade id="quote"></blockquote id="quote">Is this inherent of sprint engines? <hr height="1" noshade id="quote"></blockquote id="quote">Not in my experience - it is probably a weber thing. SUs and mapped ignition is fine for up to 150bhp with no flatspots. Here are my engine dyno stats:

http://www.btinternet.com/~triumph/images/tr7power5.jpg

The map I made was created 'on the road' and was only validated by a single power run as shown. Dyno time would have made it better - lots of money though.

Beans · Postby **Beans** » 09 May 2010 21:17

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by jeffremj

... it is probably a weber thing ...<hr height="1" noshade id="quote"></blockquote id="quote">
Nothing to do with Webers, same would be the case with SUâ€™s.
Cam shaft profile/duration is solely responsible here.

<center>

1980 TR7 DHC (my first car, currently being restored)
1981 TR7 FHC Sprint (better known as 't Kreng)
[url="http://www.tr7beans.blogspot.com/"]My Weblog[/url]</center>

jeffremj · Postby **jeffremj** » 10 May 2010 23:13

<blockquote id="quote">quote:<hr height="1" noshade id="quote"><blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by jeffremj

... it is probably a weber thing ...<hr height="1" noshade id="quote"></blockquote id="quote">
Nothing to do with Webers, same would be the case with SUâ€™s.
Cam shaft profile/duration is solely responsible here.<hr height="1" noshade id="quote"></blockquote id="quote">I am not sure why a 'beyond fast road' cam would have a flat spot at 3K rpm. Isn't that the point when they start to work (rather than further down with 'normal' cams)? I would imagine that as the Weber has multiple jets that come into action at differing points this creates the flat spots - it must be a nightmare to set up. The SU only has one jet, so no transition points. Simples.

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Dolomite sprint

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