Professional products 52mm twin blade review = questionable assembly
Thread Starter
Junior Member
Joined: Jan 2015
Posts: 42
Likes: 0
From: Dayton Nevada greater reno carson city area
Car: 1986 Iroc z28
Engine: 5.0
Transmission: 700r4
Professional products 52mm twin blade review = questionable assembly
So I bought new from summitracing after porting my upper tpi plenum to 52mm a Professional products 52 mm blade throttle body.
Twice now with 2 diffrent pp tbs I've experienced sticking while the engine is at full temp.
At first I thought this might be a vacuum issue but nope heat caused them both to stick. IMO it's pi$$ poor Chinese quality control issues. The ID and OD specifications must be out of whack. Expansion and contraction issues.
When cold they function smooth as silk. I pulled all the cables tv,throttle,cc, tps!
Thoughts or similar experiences guys?
Twice now with 2 diffrent pp tbs I've experienced sticking while the engine is at full temp.
At first I thought this might be a vacuum issue but nope heat caused them both to stick. IMO it's pi$$ poor Chinese quality control issues. The ID and OD specifications must be out of whack. Expansion and contraction issues.
When cold they function smooth as silk. I pulled all the cables tv,throttle,cc, tps!
Thoughts or similar experiences guys?
Senior Member
Joined: Mar 2003
Posts: 851
Likes: 3
From: vacaville,ca
Car: 1988 camaro z28,1997 camaro lt1
Engine: 355 afr 195 heads,tpis big mouth
Transmission: 700r-4 built by me 3-4 z pack
Axle/Gears: 3.42
Re: Professional products 52mm twin blade review = questionable assembly
Watch "Summit racing lt1 throttlebody" on YouTube
Summit racing lt1 throttlebody:
Summit racing lt1 throttlebody:
Supreme Member
Joined: Jun 2011
Posts: 2,036
Likes: 6
From: knoxville tn
Car: 86 IROC
Engine: 5.0 TPI
Transmission: 700-R-4
Axle/Gears: 2.73 open
Thread Starter
Junior Member
Joined: Jan 2015
Posts: 42
Likes: 0
From: Dayton Nevada greater reno carson city area
Car: 1986 Iroc z28
Engine: 5.0
Transmission: 700r4
Re: Professional products 52mm twin blade review = questionable assembly
Well the summit house brand tb is just a pp unit minus the sticker. The boxes are even the same size to the t. The green loc tight is even the same lol.
Its always hit or miss with china's stuff. I've noticed the taiwan stuff is usually of higher quality in general than china fob products. china freight aka harborfreight immediately comes to mind.
Its always hit or miss with china's stuff. I've noticed the taiwan stuff is usually of higher quality in general than china fob products. china freight aka harborfreight immediately comes to mind.
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